Issue #136:
- rename l10n_moz to DotLangParser
- autoload class  via Composer
-  namespace the app (Langchecker)
- setup Atoum and bootstrapping
- add a first test to a DotlangParser method (copied from Transvision)
Merge pull request #137 from pascalchevrel/issue-136-better-testing-setup

Issue #136: