Fix bugs with headers in Varnish class
Add integration tests and Travis config

Add Varnish config

Add backend to Varnish config

Add note about minimum Varnish version

Fix backend config and add debugging

Use PHP built-in webserver on Travis

Add base test class and Varnish tests

Use localhost

Add note on Varnish config

Debug PHP server start

Fix PHP server start
Merge branch 'integration-tests' of github.com:ddeboer/FOSHttpCacheBundle into integration-tests