Rewrite modifying SDP section. Fixes #8
Restore general text about modificaitons
Restore and expand text about SDP that goes over the wire
Merge pull request #43 from ekr/sdp_modifications_issue8

Rewrite modifying SDP section. Fixes #8
Removing all trailing blanks
Merge pull request #50 from alvestrand/remove-trailing-blanks

Removing all trailing blanks
Faster travis run
Merge pull request #55 from martinthomson/travis-speedup

Faster travis run
Checkpoint
Add security considerations. Fixes #53
More changes from Magnus's review
Fix a reference.
Remove sentence
Editorial issues. Fixes #45
Minor wording fix
Merge pull request #56 from ekr/issue53_security_considerations

Add security considerations. Fixes #53
Fix sentence
Merge pull request #58 from ekr/issue45_shields_editorial

Editorial issues. Fixes #45
Minor fixes from Justin
Merge commit