Added invite (via email) form.
Merge branch 'devel' of github.com:matiasb/fenics into referers

Conflicts:
	templates/base.html
Added invite your friends form.
Merge branch 'devel' of github.com:matiasb/fenics into referers

Conflicts:
	templates/base.html
Cleanup.
adde djoin processing.
Merge pull request #6 from nessita/referers

Added invite your friends feature, needs re-work.