Using Arquillian SPI for extending wars by vendor specific descriptors.

[jansupol]

Signed-off-by: jansupol jan.supol@oracle.com

[jansupol]

This is an alternative proposal to #1064. Pros:

• Using standard Arquillian SPI.

Cons:

• Requires extra java classes instead of configuration files

To me, this is probably better, since it allows more modifications to the war than just adding a single deployment descriptor file.