Shibboleth Always new account flag added.

#refs 1284
Option to force shibboleth to always create a new account added.

#refs 1284
Option to force shibboleth to always create a new account added and tested.

#refs 1284
Merge branch 'branch-v2-1284-shibboleth-always-new-account' of git://github.com/gmiotto/mconf-web into gmiotto-branch-v2-1284-shibboleth-always-new-account

Conflicts:
	db/schema.rb
Review of feature shib_always_new_account, PR #28

Biggest changes in the tests for ShibbolethController. All the rest is just
a general review.

refs 1284
Merge pull request #28 from gmiotto/branch-v2-1284-shibboleth-always-new-account

refs #1284