Update README installation instructions.
replace metasearch with ransack
Allow Spree 1.3.x use.
Use ref not sha.
Merge pull request #17 from DriesS/master

Replace metasearch with ransack
Merge pull request #14 from jdutil/simply

Update README installation instructions.
Merge pull request #18 from jdutil/1_3

Allow Spree 1.3.x use
Reimplement https://github.com/spree/spree/pull/1548 for the same reason
Add german translation.
Fix promotion rules attr_accessible. [Fix #12]