added sprockets-sass to enable support for @import directives
updated gemfile.lock
added compass support
ignore generated sass-cache folder
remove better_errors (causes segfault when running rake spec)
remove sass line comments
test @import directives
re-added bettererrors
Merge pull request #57 from bigcartel/38-at-import-directives

adds better support for sass with sprockets 2 and fixes @import directives