Fixed travis build for Linux

Brew isn't by default on linux, so we need to install it from git.
Python, php, crystal, ompl, ocml can be installed from apt, no need
for brew on linux. Elm binaries need to be fo linux on linux.

.travis.yml

@@ -14,37 +14,69 @@ script: sh build-package.sh
 git:
   depth: 10
 
-sudo: false
+php:
+  - '5.6'
+python:
+  - '2.7'
+go:
+  - release
 
-os:
-  - linux
-  - osx
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: require
+      env:
+        - ATOM_CHANNEL=stable
+    - os: linux
+      dist: trusty
+      sudo: require
+      env:
+        - ATOM_CHANNEL=beta
+    - os: osx
+      env:
+        - ATOM_CHANNEL=stable
+    - os: osx
+      env:
+        - ATOM_CHANNEL=beta
 
 env:
   global:
     - APM_TEST_PACKAGES="language-marko language-html-swig language-svg language-d mavensmate-atom"
-  matrix:
-    - ATOM_CHANNEL=stable
-    - ATOM_CHANNEL=beta
+    - PATH="/home/travis/gopath/bin:$HOME/.linuxbrew/bin:$PATH"
 
 addons:
   apt:
+    sources:
+    - sourceline: 'deb http://dist.crystal-lang.org/apt crystal main'
+    - sourceline: 'deb http://ppa.launchpad.net/avsm/ppa/ubuntu trusty main'
+    - sourceline: 'deb http://ppa.launchpad.net/ubuntu-lxc/lxd-stable/ubuntu trusty main'
     packages:
     - build-essential
     - git
     - libgnome-keyring-dev
     - fakeroot
+    - crystal
+    - ocaml
+    - camlp4
+    - opam
+    - php5-cli
+    - golang
 
 cache:
-    - pip: true
-    - bundler: true
-    - directories:
-        - vendor/bundle # gems are installed here, https://docs.travis-ci.com/user/languages/ruby/#Dependency-Management
-        - node_modules
-        - $HOME/.atom
-        - $HOME/.stack
+  pip: true
+  bundler: true
+  directories:
+    - vendor/bundle # gems are installed here, https://docs.travis-ci.com/user/languages/ruby/#Dependency-Management
+    - node_modules
+    - $HOME/.atom
+    - $HOME/.stack
 
 before_install:
+  # Install Homebrew on Linux
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      git clone --depth=1 https://github.com/Linuxbrew/brew.git ~/.linuxbrew || true;
+    fi
   # Update Homebrew
   - brew update
   - brew tap homebrew/dupes
@@ -55,7 +87,9 @@ before_install:
   - gem install htmlbeautifier
   - gem install puppet-lint
   # Python language support
-  - brew install python
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install python; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo chmod 777 -R /opt/python; fi
+  - pip install --upgrade pip
   - pip install --upgrade autopep8
   - pip install --upgrade isort
   # SQL language support
@@ -64,11 +98,18 @@ before_install:
   - brew install uncrustify
   # PHP
   - brew tap homebrew/homebrew-php
-  - brew install php56 || true
-  - brew gist-logs php56 || true
-  - echo -e "\n[Phar]\nphar.readonly = Off\n" >> /usr/local/etc/php/5.6/php.ini
-  - brew install php-cs-fixer || true
-  - brew gist-logs php-cs-fixer || true
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      brew install php56 || true;
+      brew gist-logs php56 || true;
+      echo -e "\n[Phar]\nphar.readonly = Off\n" >> /usr/local/etc/php/5.6/php.ini;
+      brew install php-cs-fixer || true;
+      brew gist-logs php-cs-fixer || true;
+    fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      wget http://get.sensiolabs.org/php-cs-fixer.phar -O php-cs-fixer;
+      chmod a+x php-cs-fixer;
+      mv php-cs-fixer $HOME/.linuxbrew/bin/php-cs-fixer;
+    fi
   # CoffeeScript
   - npm install coffee-formatter
   # Haskell
@@ -76,11 +117,20 @@ before_install:
   # - stack setup
   # - stack install stylish-haskell
   # Elm
-  - curl -L -o /tmp/elm-format.tgz https://github.com/avh4/elm-format/releases/download/0.2.0-alpha/elm-format-0.2.0-alpha-mac-x64.tgz
-  - tar xvzf /tmp/elm-format.tgz -C /usr/local/bin
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      curl -L -o /tmp/elm-format.tgz https://github.com/avh4/elm-format/releases/download/0.2.0-alpha/elm-format-0.2.0-alpha-mac-x64.tgz;
+      tar xvzf /tmp/elm-format.tgz -C /usr/local/bin;
+    fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      curl -L -o /tmp/elm-format.tgz https://github.com/avh4/elm-format/releases/download/0.2.0-alpha/elm-format-0.2.0-alpha-linux-x64.tgz;
+      tar xvzf /tmp/elm-format.tgz -C $HOME/.linuxbrew/bin;
+    fi
   # OCaml
-  - brew install ocaml opam
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      brew install ocaml;
+      brew install opam;
+    fi
   - opam init --auto-setup
   - opam install --yes ocp-indent
   # Crystal
-  - brew install crystal-lang
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install crystal-lang; fi