Update documentation for srtp_protect() to warn users of potential buffer overflow.
Merge pull request #25 from cisco/docupdate

Update documentation for srtp_protect() to warn users of buffer overflow
Remove double-invocations to prevent buffer-overflow vulnerability.
Fix 32-bit tag policies to use correct profile.
Undo the changes to the RTCP profile helper function.  The prior commit was not compliant with RFC 3711.
Merge pull request #27 from cisco/docupdate

Docupdate
Zeroize nonce value before use to clear an garbage that may have been present on the stack.
Merge pull request #31 from cisco/general-fixes

Correct intermittent failure in stat_driver on sparc 64 target
Add support for [draft-ietf-avtcore-srtp-aes-gcm-07]
Add support for building shared library (libsrtp.so)
Sync latest changes from master.