Updated year in LICENSE file.
podspec updated with latest tag.
Re-generated documentation.
Merge remote-tracking branch 'origin/master'
Removed commit SHAs from HISTORY.md.
Added guidelines for contributing.
Updated Contributing section of README.
Added support for getting external session URL.
Added support for the feature which allows an API caller to get a URL which initiates a login for an external Campaign Monitor session.

API docs: http://www.campaignmonitor.com/api/account/#single_sign_on
Generated docs.
Version 1.1.0.
Merge branch 'master' into use-travis

Conflicts:
	CreateSend.podspec
Use xctool.