Additional improvements for DS2DS action: Reprojection

This improvement allow to perform a reprojection from the SourceFeature to OutputFeature when a DS2DS is performed.

The changes are:

* Change the behaviour of outputCRS settings in **DS2DSaction.java**

* New field in **Ds2dsConfiguration.java**

* Improved **DsBaseAction.java** in order build a query specifying the target CRS to use during reprojection

* New test called testReprojection in **ActionTest.java**

* Documented the new configuration field in DS2DS sphinx doc

All DS2DS tests still works on Eclipse and a compilation with *mvn clean install -o -Dall* has been succesfully performed. The action has been tested on tomcat performing an ingestion of several shapefiles in 3 differents CRS and reprojected in EPSG:4326. Everything seems works.