0.5.0

Added

• Support for custom directives, parsers, and renderers

Changed

• Major refactoring to de-couple directives from the parser, support custom directive functionality, and reduce complexity
• Updated references to stmd.js in README and docblocks
• Modified CHANGELOG formatting
• Improved travis configuration
• Put tests in autoload-dev

Fixed

• Fixed CommonMarkConverter re-creating object each time new text is converted (#26)

Removed

• Removed dependency on symfony/options-resolver (fixes #20)