Merge pull request #33 from assemble/develop

v0.4.6
Merge pull request #34 from assemble/develop

v0.4.7
Merge pull request #36 from assemble/develop

v0.4.8
Merge pull request #37 from assemble/develop

v0.4.8
Merge pull request #38 from assemble/develop

v0.4.9
removes non-contrib plugins
minor grammar/metadata edits, simplify installation instructions so they make sense on all OS
Merge pull request #39 from jonschlinkert/master

remove non-contrib plugins, minor edits
v0.4.10