refactored box2d example
merging
added csparse example
Merge remote-tracking branch 'biidocs/master'
Merge remote-tracking branch 'biidocs/master'
Merge remote-tracking branch 'biidocs/master'
deleted features section; renamed other sections; added Integration section; added GTest example; fixed grammar errors; pending to update mains.bii and dependencies.bii
solved conflicts
Merge pull request #114 from franramirez688/master

refactored box2d example; Added csparse example