update badge to gitter room

Change _.contains to _.includes for lodash 4.0.0

appveyor.yml tweaks

3.1.1

Merge pull request #593 from stephanebachelier/uglify-task-naming

fix typo in test description

flow now support both uglify and uglifyjs naming

add notice about breaking change

3.1.0

readme tweaks

package.json tweaks

bump `chalk`

Merge pull request #580 from TrevorS/patch-1

Typo, an -> and.

Use `path-exists`