change comment about precision support

node-sass does support the precision option since 0.9.2
BUT libsass currently has a bug...
Merge pull request #641 from amitport/patch-1

change comment about precision support
move asset files to assets/
pure scss asset helpers, new paths
provide a concatenated js file by default
readme asset path helpers [ci skip]
readme [ci skip]
Require the right test-unit
Fix compass manifest

Compass generator will copy javascripts and fonts on project creation
Refs #645
Readme Update [ci skip]
remove autoprefixer-rails dependency from gemspec

The gem can be used without Rails.
changelog [ci skip]
readme [ci skip]
add autoprefixer as dev dependency
do not require autoprefixer-rails
rake convert
update bower:generate task
rake convert
converter: fetch from raw.githubusercontent.com
converter: improve cache