Travis: Initiating build for commit 'd3de7b6e8214803917864cc8b1ee65983d25b423' on branch 'getRequestVarTest': do not lose value in case it is an integer or a float. Instead convert it to a string.

Eg this returned the default value in the past: `Common::getRequestVar('param', 'string', 'default', array('param' => 5))` which can happen eg in BulkTracking etc. causing many values not to be tracked. Wondering if it breaks anything.