Merge pull request #6 from michaelcullum/master

[Improvement] Flesh out the readme a little
[Bug] Move this onto this line to make clover happy
[Improvement] Update phpunit to 4.0
[Feature] Let's try setting up scrutinizer & travis intergration
[Bug] CC should be external
[Bug] Travis gets very clogged so we should probably have some more patience with it
Added changetracking regex

Partly taken from https://scrutinizer-ci.com/docs/tools/change-tracking/
[Fix] Disable external code coverage on scrutinizer
Double escaped [?
Update to Symfony 2.4.4
[Improvement] Add php 5.6 support to travis
[Fix] Remove remanants of scrutinizer integration
Add Sensio Security Checker
Make the extensions blurb a bit better and put the extensions rules and guidelines page on the Symfony site.
Stop merging if command returns non zero response
Update our tests.sh script
Fixing tests
Change merge script to look a little more friendly
Make further changes to merge.sh to make it look better
Fix a typo