Revert "sprockets: depend_on relative path #592 #689"

This reverts commit 2eb5fafeb7608e2ceadd215b3924f60aa3d83230.
See https://github.com/rails/sass-rails/issues/241
streamline tests, switch to minitest
tests: clean sass cache before CompilationTest

also update sass 3.4 and compass 1
sass test fix
add nodejs dependencies to package.json
added images folder
Merge pull request #705 from everaldo/master

added images folder
Merge pull request #702 from intuxicated/fix-node-dependency

add nodejs dependencies to package.json
Port over fixes from branch next
Bump to 3.2.0.2
travis
rbx require without extname
rbx test/support require path
changelog links
Merge branch 'master' into next

Conflicts:
	assets/stylesheets/bootstrap/_variables.scss
	lib/bootstrap-sass/version.rb
	test/test_helper.rb
rake convert
converter: avoid shelling out to awk
Drop Sprockets `depend_on`

Sprockets does not require depend_on for our use case since v2.1.4
Drop the directives, and instruct Rails users to use sprockets-rails
v2.1.4+.

Profit: Bower package can now be used from Rails

Related issues: #592, #689
rake convert
Rails Readme: clarify @import order requirements

See https://github.com/twbs/bootstrap-sass/issues/692#issuecomment-55091209