Grunt is not used anymore. Why?
Grunt is realy useful when you want to do some tasks to several files,
like jslint src/**/*.js. But in this case, each files have their own
specific dependencies. For instance, davstorage has jIO, jQuery and Base64,
revisionstorage has jIO and hex_sha256, jio.outro needs hex_md5, etc.
Why use a Makefile?
- All developers know Makefiles
- We can choose a task by typing "make <task>"
- It is more extensible than grunt
- It removes grunt dependency

some jiotests_withoutrequirejs scripts were moved/removed/added,
jiotests.js updated to use only required denpendencies

The localStorage wrapper is not working on Chromium

Storages are now able to keep some vars in memory in their own environment.
For instance, if the storage tree is revision + local, "revision" will have an
environment and "local" will have another one.
For the futur "replicate revision storage", the environment will contain objects
in order to get the good revision for the good substorage.
Of course, if there are several "replicate revision storage", every one will have
its own environment.