Merge tag 'v0.1.32' into develop

Changelog

1. The file `loader` is optional
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Merge branch 'develop' of github.com:crodas/ActiveMongo2 into develop
Added Mongo-namespace support

Mongo namespace are supported via configuration. It is like a sub-set of your database (like a database inside another database)
Improved travis testing
Adding support for multiple connections

Added basic support for multiple connection (by default the connection is named 'default'). The document classes will have the ability to choose using annotations which connections they should use
Added tests for named connections

Making sure that multiple connections works as expected
Improved multiple connection tests

+ Added better testings for multiple connections
+ Improved index creation (fail silently *if* the connection is not yet ready)
Added unit test for multiple connections
External connections can have their own namespace
Bump version before release
Merge branch 'release/v0.2.1'