Some css issues.

Agenda mails.
Invitation used 404 page.
Fixed error when trying to delete invitation
Merge branch 'master' into release_sprint_5
added name field to Invitation model
English site css.

Remove new-style css and combined to 1 css.
Add style.css for english.
Added csv import sample file.
Some styles.
Some admin layout modification (list, sort, filter).
Redesigned meeting participants form template.
Some trello issues with invitations & existing invitations.
Changes location of csv sample file
Merge remote-tracking branch 'amir/master'

Conflicts:
	src/communities/models.py
	src/communities/templates/emails/agenda.html
	src/issues/admin.py
	src/meetings/templates/meetings/meeting_detail.html
	src/ocd/static/new_style-rtl.css
	src/ocd/static/style-rtl.css
	src/ocd/templates/registration/password_reset_form.html
	src/users/admin.py
	src/users/forms.py
	src/users/locale/he/LC_MESSAGES/django.mo
	src/users/locale/he/LC_MESSAGES/django.po
	src/users/migrations/0003_auto__add_field_invitation_name.py
	src/users/models.py
	src/users/templates/users/invitation404.html
	src/users/views.py
commit
handle more exceptions in import invitations
Merge remote-tracking branch 'yaniv/master'
tickets for release 6.5