Add changeable CMS_PERMISSION
Added translation for cancel button on review deletion page.
Added german translation for abort button.
Merge pull request #90 from EuroPython/feature/reviews

Fixed #79
Fixed #88 -- Add proposal version title to list views

Due to the complex database scheme, this commit also improves the query
sets to drop from ~20ms to ~3ms with about 200 reviews on my local
machine. There are some more improvements possible, but this should work
for now.
Merge pull request #91 from EuroPython/fix/ticket88

Fixed #88 -- Add proposal version title to list views
Don't hide review menu for staff members
Add Vagrantfile for easier local environment setup.
Update README to include npm install and update compass version.
Merge pull request #97 from EuroPython/feature/vagrant

Add Vagrantfile for easier local environment setup.
Remove dead code

(found by looking for https://www.djangoproject.com/weblog/2014/mar/22/strip-tags-advisory/)
Fix #102 - Show canceled purchases in profile area

Canceled purchases are now shown in the profile area, with a warning and
without the button to resend invoices.
Fix #101 - Make tickets assignable to other users.
Add translation for canceled purchase message
Various fixes related to #101.
Less fuzz ...
Split up Ticket model to support ticket types carrying different
information. Right now, there are three kinds:

* Support Ticket: No additional infomration.
* Venue Ticket: Additionally requires first and last name, T-Shirt size
and optional organization.
* SIM Card Ticket: In addition to Venue Ticket also the address of the
(local German) host is required to be able to activate an ordered SIM
card.
Merge pull request #107 from DasIch/show-canceled

Fix #102 - Show canceled purchases in profile area
Fixed #73 -- don't escape quotation marks in comment mail
Fix #94 - Order sponsors by level and date added