[FixInstall] Removed bootstrap.php.cache
[FixInstall] Added a check for exceptions

After having downloaded the project's source, running the console will
raise en exception because the database doesn't exist yet.

This is caused by the repository call in a configure method: when the
console is running, every commands are instanciated, calling every
configure methods.

Solution provided by @tucksaun in the issue #3: simply catching the
exception. Thank you!
[FixInstall] Fixed phpunit configuration

The configuration was still calling the bootstrap.php.cache file
which have been removed.
[0.2.2] Updated the changelog
Merge pull request #3 from gnugat/fix/install

Installation is broken