Configuration properties change between `1.3.0.M3` and `1.3.0.M4`

.New keys in `1.3.0.M4`
|======================
|Key  |Default value |Description
|`spring.datasource.type` | |Fully qualified name of the connection pool implementation to use.
|`spring.messages.fallback-to-system-locale` |`true` |Set whether to fall back to the system Locale if no files for a specific Locale have been found.
|======================
