Fixes an issue where if primary_key-attribute was used on a field other than "id" the dynamodb-adapter would get into a infinite loop and eventually crash.
Add boolean types. 

They are stored in DynamoDB like strings; "__true" and "__false"
Hide the __metadata-record when querying
Merge pull request #114 from burbas/dynamo_db

DynamoDB improvements
Fix for #112 - be aware of types when building insert query.
Fix update while we are at it.
Merge branch 'master' of git://github.com/evanmiller/boss_db
Merge pull request #115 from davidw/master

Fix for #112
Added boss_db:migrate support in Mnesia.
Merge pull request #116 from entronic/master

boss_db:migrate support in Mnesia