Merge branch 'release/0.8' into stable
Merge branch 'release/0.9' into stable
Add autoprefixer support.
Fix options dict.
Merge branch 'add-autoprefixer' of https://github.com/YesGraph/webassets
fixed webassets issue #286 (and switch I/O to binary-mode)
added unit test for fix to issue #286
changed python loader to allow custom environment name
removed lines from test file
cleaned up the code and removed a print statement
forgot a second print statement
Merge branch 'prefixed-python-loader' of https://github.com/ahlen/webassets
Merge pull request #287 from metagriffin/feature/issue-286

fix for issue #286 (ExternalTool not re-opening {output} file)