Name things :)
Refactor FileWatcher
move contracts from gemfile to gemspec
actually, just depend on it
Fix some bugs in the Slim renderer when converting to Extensions
Merge pull request #1228 from middleman/file_watcher_refactor

FileWatcher Refactor
Separate Build from Thor
Merge pull request #1319 from middleman/builder_api

Separate Build from Thor
WIP Collections
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