Merge pull request #42 from kirberich/master

Add ComputedFields
Update README.md
Merge pull request #43 from mattdoughty/patch-1

Update README.md
Merge branch 'master' of https://github.com/lukebpotato/djangae
Update contributions section, ironically in master
Possibly fix a problem with calling get_db_prep_save too often. I'm 65% sure this is not the right fix, because I really don't know what's going on.