added import sorting using isort + small yapf fix

src/beautifiers/autopep8.coffee

@@ -15,10 +15,24 @@ module.exports = class Autopep8 extends Beautifier
 
   beautify: (text, language, options) ->
     @run("autopep8", [
-      @tempFile("input", text)
+      tempFile = @tempFile("input", text)
+      "-i"
       ["--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"
       })
+      .then(=>
+        if options.sort_imports
+          @run("isort",
+            [tempFile],
+            help: {
+              link: "https://github.com/timothycrosley/isort"
+          })
+          .then(=>
+            @readFile(tempFile)
+          )
+        else
+          @readFile(tempFile)
+      )

src/beautifiers/yapf.coffee

@@ -15,8 +15,22 @@ module.exports = class Yapf extends Beautifier
 
   beautify: (text, language, options) ->
     @run("yapf", [
+      "-i"
       ["--style=pep8"]
-      @tempFile("input", text)
+      tempFile = @tempFile("input", text)
       ], help: {
         link: "https://github.com/google/yapf"
+      }, ignoreReturnCode: true)
+      .then(=>
+        if options.sort_imports
+          @run("isort",
+            [tempFile],
+            help: {
+              link: "https://github.com/timothycrosley/isort"
           })
+          .then(=>
+            @readFile(tempFile)
+          )
+        else
+          @readFile(tempFile)
+      )

src/languages/python.coffee

@@ -41,5 +41,9 @@ module.exports = {
       items:
         type: 'string'
       description: "do not fix these errors/warnings"
+    sort_imports:
+      type: 'boolean'
+      default: false
+      description: "sort imports (requires isort installed)"
 
 }