Add some informations in README
Make minify opt-in step
Merge pull request #2 from r-gaia-cs/readme

Add some informations in README
Merge pull request #1 from r-gaia-cs/make

Make minify opt-in step
Some changes to Raniere's commit.
Remove experimental support for automatic grouping based on operator priority (takes too much time to compile and does not work in all cases)
Merge branch 'master' into gh-pages
Remove experimental support for automatic grouping based on operator priority (takes too much time to compile and does not work in all cases)
Merge branch 'master' into gh-pages
Update from master.