Added license

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638196 13f79535-47bb-0310-9956-ffa450edef68
[MASSEMBLY-583] Added testcase (fixed MASSEMBLY-726, r1637662)

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638197 13f79535-47bb-0310-9956-ffa450edef68
Added precedence check for file items

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638198 13f79535-47bb-0310-9956-ffa450edef68
[MASSEMBLY-655] Further improved docs

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638200 13f79535-47bb-0310-9956-ffa450edef68
[MASSEMBLY-609] Proper docs on how to interpolate artifacts

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638201 13f79535-47bb-0310-9956-ffa450edef68
Added faq entry. Removed groupings

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1638205 13f79535-47bb-0310-9956-ffa450edef68