Renamed "name" field in mysql configuration as "database".
Implemented MySql storage provider & mpos storage layer.
Started implementing hybrid storage layer.
Added empty storage layer for invalid configurations.

How storage layers & providers work:
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<raistlinthewiz> first we have conceptial storage layers
<raistlinthewiz> like mpos is one and hybrid is another one
<raistlinthewiz> so storage layers can have one or more underlying storage providers and layers hide the implementation from others
<raistlinthewiz> so basically, mpos layer does just have an underlying mysql layer (in the feature we can even add sqlite support)
<raistlinthewiz> on the other side, hybrid layer does have two underylying providers; mysql + redis
<raistlinthewiz> so basically no body other then the storage-layer itself is aware of the implementation or where the data is written