Fixed method name
Convert PlayJavaScriptPlugin into a RuleSource plugin
Turn PlayApplicationPlugin into RuleSource plugin

- Added new ‘play’ plugin to combine RuleSource plugins
Split PlayTestPlugin out of PlayApplicationPlugin
Use @BinaryTasks in PlayCoffeeScriptPlugin and PlayJavaScriptPlugin
Convert PlayCoffeeScriptPlugin to RuleSource
Add workaround to allow user to set custom coffeeScript JS