autoprefixer support
pass browsers as array to autoprefixer filter
redirect autoprefixer output to file due to proc_open bug on windows
removed duplicate output option
Explicitly specify fonts directory

Fixes a bug where the fonts directory was specified in the compass configuration. The compass configuration assumes assumes the directory is a  relative path from the specified project path (currently `sys_get_temp_dir()`).
implemented getChildren for ScssPHP filter
recursively find dependencies
added test
renamed attribute StringAsset->$content to StringAsset->$string to avoid serialization issues with BaseAsset->$content
Merge pull request #565 from shaula/master

renamed attribute StringAsset->$content to StringAsset->$string to ...
updated JSqueezeFilter namespace

In the core provided filters namespace list changed:
JSqueeze to JSqueezeFilter
Merge pull request #581 from renarsvilnis/patch-1

updated JSqueezeFilter namespace
treat embedded templates as child nodes in TwigFormulaLoader.
Stop FilesystemCacheTest from failing if /tmp/foo exists
Merge pull request #589 from fredemmott/filesystemcachetest-master

Stop FilesystemCacheTest from failing if /tmp/foo exists
Added testing on HHVM andPHP 5.6 on Travis
Fixed StylusFilter tests
test that the assets from the embedded template are loaded.
Merge pull request #585 from bangpound/hotfix/load-assets-from-overridden-blocks-in-embed-template

Assets defined in overridden blocks of embedded Twig templates are not loaded
Fix broken compass test in ScssphpFilter

The scss lib throws an exception if you reference an undefined mixin,
which is what this test does. I've split it into two tests - one
checking that the mixin works when compass is enabled, and the other
checking that it throws an exception when the mixin is referenced and
compass is not enabled.