Appliaction wizard: git url field validates to error if git url starts with a space

Steps to reproduce:

1. EXEC: launch OpenShift application wizard
2. EXEC: hit Advanced and uncheck Use Default Source Code, provide a valid git url that starts with a space in Source Code (ex. " git://github.com/openshift/etherpad-example.git"

Result:
The Source Code field is marked as non-valid

Expected result:
A space in the beginning or in the end should not harm, it should simply get trimmed