[TASK] Change travis configuration to build PHP modules

Many of the unit tests are skipped because dependencies
to certain PHP modules are not matched.

Add a script that sets up certain dependencies like
igbinary or memcached to lower the number of skipped tests.

Change-Id: I432809066f65ea5c1be33c478cecae49057b2a36
Releases: 6.0
Reviewed-on: http://review.typo3.org/12485
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel