added segment.io python library
send first and last name separate
added server side segment.io events to registration/invitation/create course
added alias call to the verification email sent page
added tracking for creating assignments/compositions/discussions
updated mocks in tests
indentify call to segment.io now happens only if debug is turned off
removed google analytics code from the template
Merge pull request #11 from appsembler/feature/44-segmentio-tracking

Feature/44 segmentio tracking