See #311. Show installation instructions when beautifiers are missing

- autopep8
- perltidy
- ruby-beautify
- sqlformat
- uncrustify

src/beautifiers/autopep8.coffee

@@ -20,4 +20,6 @@ module.exports = class autopep8 extends Beautifier
             ["--max-line-length", "#{options.max_line_length}"] if options.max_line_length?
             ["--indent-size","#{options.indent_size}"] if options.indent_size?
             ["--ignore","#{options.ignore.join(',')}"] if options.ignore?
-            ])
+            ], help: {
+                link: "https://github.com/hhatto/autopep8"
+            })

src/beautifiers/perltidy.coffee

@@ -25,4 +25,6 @@ module.exports = class PerlTidy extends Beautifier
             '--quiet'
             "--profile=#{options.perltidy_profile}" if options.perltidy_profile?
             @tempFile("input", text)
-            ])
+            ], help: {
+                link: "http://perltidy.sourceforge.net/"
+            })

src/beautifiers/ruby-beautify.coffee

@@ -16,4 +16,6 @@ module.exports = class RubyBeautify extends Beautifier
         @deprecate("Ruby-Beautify has been deprecated in favour of Rubocop beautifier.")
         @run("rbeautify", [
             @tempFile("input", text)
-            ])
+            ], help: {
+                link: "https://github.com/erniebrodeur/ruby-beautify"
+            })

src/beautifiers/sqlformat.coffee

@@ -19,4 +19,6 @@ module.exports = class sqlformat extends Beautifier
             "--indent_width=#{options.indent_size}" if options.indent_size?
             "--keywords=#{options.keywords}" if options.keywords?
             "--identifiers=#{options.identifiers}" if options.identifiers?
-            ])
+            ], help: {
+                link: "https://github.com/andialbrecht/sqlparse"
+            })

src/beautifiers/uncrustify/index.coffee

@@ -75,7 +75,9 @@ module.exports = class Uncrustify extends Beautifier
                     outputFile = @tempFile("output", text)
                     "-l"
                     lang
-                ])
+                ], help: {
+                    link: "http://sourceforge.net/projects/uncrustify/"
+                })
                 .then(=>
                     @readFile(outputFile)
                 )