few cullen changes
Merge branch 'master' into cj2
Merge branch 'master' into cj2
Updated refernces to current drafts
change SDES to must not and few other ref clean ups
Move 3960 from normatiive to informative ref
add some xref for draft references
added missing refs for RFCs
clean up cruft in ref section
Removed note that seem no longer true
one more SDES fix
Merge pull request #3 from juberti/cj2

Cullen edits - fit to 72 columns, fix up references, update out of date text on SDES
Merge pull request #7 from juberti/cj4

Remove a remaining SDES reference
Apply Cullen's typo fixes; handle null candidate; resolved TODOs in SDP example
Added "it's a blob" section; moved SDP RFC list to be closer to where it is used; started digging into createAnswer guts.
Fixed up rtx stuff, more answer stuff, added SDP answer plus some fixes to offer SDP
Finished first ver of createAnswer text; changed some must->MUST
Marked null candidate stuff as OPEN ISSUE; fixed compile errors and warnings.
rename file from -03 to -04
fix up some bundle port stuff