ES6 Support

Added

• Support for arrow functions in JavaScript (see #28)
• Support for ES6 generator functions in JavaScript (see #32)
• Detect PHP &-functions (see #31)
• Detect static functions in PHP (see #33)
• Japanese translation, thanks to @nishioka

Fixed

• Allow all characters in PHP function arguments (see #33)
• Skip CSS lines with more than 1000 characters (see #37)

Changed

• Update to Brackets 1.2 API
• Updated Ionicons to version 2.0.1