[CentOS] [CentOS-announce] Release for CentOS Linux 7 (1503 ) on x86_64

<thought> minor version vs rolling Everything - this implies that the origin 
base has one root - but thats not the case (pragmatically speaking). There is 
still a "rebase" or at least a incompatibility between the minor versions 
(as shown recently 7.0->7.1 for kernel modules) and stated in the list by 
Johnny (different context, for EL6):

   <quote>"As far as what kernel is designed for which release ... every point
   release (minor version) will have its own kernel branch associated with
   it..."</quote>

There exists more examples where this "borders" are important. So, breaking the 
borders between the minor releases will make the things more intransparent. 
Rolling it within a minor release is still great. </thought>

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LF