adding in the .js.coffee, .css.less, .css.scss extensions
Merge branch 'master' into testing
adding readme about nginx https://github.com/CodeSleeve/asset-pipeline/issues/51
adding in sprockets_filters https://github.com/CodeSleeve/asset-pipeline/issues/79
adding EnvironmentFilter decorator https://github.com/CodeSleeve/asset-pipeline/issues/80
changing the config to default to empty array() for sprockets_filters