Fix typos in REST API documentation.
Merge remote-tracking branch 'upstream/master'
consistent whitespace across the .rst docs, some minor corrections
Add sip out TwiML verbs
Variable name cleanup
python 3 breakage
Reverting local change.
Fixing documentation of phone number purchase parameter.
Merge pull request #111 from alexcchan/master

Documentation fixes for conferences and phone numbers.
Delete Headers and Header
Merge branch 'master' into sipout-twiml
Remove Header test
Bring code up to PEP8 compliance
Bring tests up to PEP8 compliance (almost)
Remove incorrect Python3 dependencies
Merge pull request #112 from twilio/flake8

Add automatic PEP8 compliance via Flake8
Merge pull request #110 from twilio/sipout-twiml

Add sip out TwiML verbs
Fix merge conflicts
Fix PEP8 issues
Bump version to 3.4.4