Use RuntimeException instead of QueryProfilerException
Remove unnecessary isOp variable
Revise Twig extension name
Use the default error handler
Remove GitHub ribbon from the index view
Remove unnecessary timezone code

Twig is already configured to print dates in the default timezone.
Bump Silex dependency and update composer.lock
Update README links and connection documentation
Merge pull request #9 from jmikola/cleanup

Various small revisions and code cleanup