added ploneintranet.invitations
implemented invitations
changed invitation email handling logic to be able to test it
added some tests
ignore local invitations checkout
ignore invitations from coverage
added workspace invitations tests
updated travis.cfg to get ploneintranet.invitations via https
fixed to handle TokenAccepted event only if a token created by us
Merge branch 'invitations'

Conflicts:
	buildout.cfg