Fix sass test fixture
Catch execjs error subclass

Conflicts:
	test/test_environment.rb
Merge branch '2.x'
Clean absolute paths on find_asset
Merge pull request #638 from sstephenson/clean-absolute-path-for-find-asset

Clean absolute paths on find_asset
Add note about relative find asset ".." fix
Sprockets 2.12.2
Merge branch '2.x'

Conflicts:
	README.md
	lib/sprockets/base.rb
Note gz change