Added new terminology proposed by Ben.
Clarified the use of OC-Feature-Vector AVP.
Corrected the OC-Algorithm AVP and the multiplicity of the Reduction-Percentage AVP.
Clarified the use of OC-Feature-Vector & OC-OLR AVPs use in requests.
Clarified the registration of new features.
Clarified the protocol extensibility.
Changed the ValidityTime to ValidityPeriod.
Moved the DIAMETER_TOO_BUSY into appendix (for future specs to solve).
Clarified the bi-directional behavior. Now the requester & reporter roles are more clear and separate.

Signed-off-by: Jouni Korhonen <jouni.korhonen@broadcom.com>