Add CM Legal (1 of 2)

Allow defining a ro.cmlegal.url to for T&C and Privacy Policy

Change-Id: I45ffbdd9e472e258ed8c5a63dff0f3b9c7bc04e2
Fix custom unofficial build tags

Before: CM_VERSION=11-20131217-UNOFFICIAL"-LegacyXperia"-smultron
After:  CM_VERSION=11-20131217-UNOFFICIAL-LegacyXperia-smultron

Change-Id: Ib9c58b39efc4dc5a51380c647db9f7896e165704
Merge "Add CM Legal (1 of 2)" into cm-11.0
Merge "Fix custom unofficial build tags" into cm-11.0
Customize build