added venus metas for tests files + the dependency in package.json
removed tests.html as it's no longer needed with venus
added possibility to run unit tests via grunt
now ignoring generated file coverage.csv (by venus)
removed the closure on the xhr listener by using .bind on the method
Merge branch 'develop' into feature/storage-engine

merged in order to get modifications made about tests suite
#6 removed the context of the callback as it can be set via .bind()
#6 implemented the crud + find methods of the rest engine
#6 changed a bit in the philosophy part about closures, zero closure not possible as seen in last commit with the callbacks