[#1289] tastypie auth

[KasperBrandt]

@kardan Could you check this? It should work now (http://rsr.akvotest.org/api/v1/project/1605/?format=xml&depth=2 now gives a different error when not logged in).

Since this is causing issues with a partner (VEI), whose website is down now (see #1259), we'd like to do a hotfix tomorrow.

[iperdomo]

Checklist

• Test plan
• Copyright header
• Code formatting

[landscape-bot]

Repository health increased by 0.01% when pulling b0343ce on 1289_tastypie_auth into 45fef4d on develop.

• 1 new problem was found (including 0 errors and 1 code smell).
• 3 problems were fixed (including 0 errors and 3 code smells).