added the WebProfiler in the dev environment
updated composer
added composer.lock to .gitignore
added WebProfiler (http://fabien.potencier.org/article/66/debugging-silex-applications-just-got-funnier)

Merge branch 'master' of https://github.com/fabpot/Silex-Skeleton

Conflicts:
	.gitignore
	composer.json
	src/app.php