Upgrade to Maven War plugin 2.5

Release Notes - Maven WAR Plugin - Version 2.5

** Bug
    * [MWAR-305] - Filtering doesn't work as expected after switching from maven-filtering:1.0-beta-2 to maven-filtering:1.1 
    * [MWAR-306] - [regression] Filtering doesn't work if a lone @ is found in a line to interpolate
    * [MWAR-311] - Filtering of resources broken in version 2.4
    * [MWAR-312] - Document about Skinny War might need update

** Improvement
    * [MWAR-313] - Upgrade maven-filtering to 1.2
    * [MWAR-316] - MavenProject/MavenSession Injection as a paremeter instead as a component.
    * [MWAR-317] - Upgrade to Maven 2.2.1 compatiblity
    * [MWAR-319] - Fix RAT Report
    * [MWAR-320] - Update version of plexus-archiver to 2.6.1
    * [MWAR-321] - Upgrade plexus archiver to 2.6.3
    * [MWAR-322] - Removed dependency plexus-container-default:1.0-alpha-9-stable-1
    * [MWAR-323] - Upgrade xstream version to 1.4.4
    * [MWAR-324] - Upgrade plexus-io to 2.1.3
    * [MWAR-325] - Fixed CPD / Checkstyle WARNINGS

** Task
    * [MWAR-302] - Use the maven-mapping shared component