remove symfony bundle generator boilerplate.
Support Symfony 2.4

[Monolog Bundle README][1] advises this version constraint for better
compatibility.

[1]: https://github.com/symfony/MonologBundle/blob/master/README.md
Complete the unfinished test.
Minimum stability doesn't serve any apparent purpose here.

The tests run fine without this setting, and all the dependencies
have stable version constraints.
documentation on monolog bundle is incorrect. the constraint has to be reduced.
add gitkeep.
add reset command.

inspired by FOS bundle for elastica client.
use monolog service tagging.
fix syntax error.
handler not processor.
strip out logging and override base class.
code style.
improve checks before resetting an index.
code style.
update elasticsearch dependency.
rename bundle and namespace.