the default doesn't need to pass in anything
Merge pull request #149 from jonschlinkert/master

updates to tests, log messages and README
Merge pull request #150 from jonschlinkert/master

fix drop-off sentence in readme, add examples of custom options
Merge pull request #152 from jonschlinkert/master

add quote to readme
Merge pull request #153 from jonschlinkert/master

fix link
update extensions map to process handlebars templates in files with `.html` and `.htm` extensions by default
Merge branch 'master' of https://github.com/assemble/assemble
updating to allow passing in an init function to the engine plugins.
exposing engine on the assemble.engine object
Merge pull request #156 from doowb/master

Adding init method to assemble.engine and exposing engine on assemb.engine
adding a util object to assemble with a collection helper
updating specific collection functions to call generic collection utility
updating to omit and re-add collections to the pageContext based on the list of collections in the options
processing all collections for each page and adding to the root context
Merge pull request #157 from doowb/master

Adding support for optional collections
Merge remote-tracking branch 'refs/remotes/github.com/master'
made js-yaml a dependency