MPECLIPSE-127 : add support for wtp 1.5
Dynamically set java and servlet versions in the facet descriptor
Add a new property maven.eclipse.enable to avoid to have to define some natures to enable wtp
Update documentation
Generates project settings to store the compiler source and target levels
git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@531133 13f79535-47bb-0310-9956-ffa450edef68
