Use non-infringing language for plugin name

We are supposed to call it the "NAR plugin for Maven" or
(less ideally but shorter) the "NAR Maven plugin".

For details, see this message from the maven-users list:
http://mail-archives.apache.org/mod_mbox/maven-users/201306.mbox/%3CCA%2BnPnMzeORcpFL8gGq%3DycKFgSE-5WzBHM8PuvX-NZqOBEF6J0A%40mail.gmail.com%3E

The most relevant paragraph is:
> The allowed pattern of usage is that where the use of the mark is
> referring to the plugin being for use with Maven, hence "___ Plugin
> for Maven" is fine but "Maven ___ Plugin" is not. Obviously "___'s ___
> plugin for Maven" is even better, e.g. "Mojo's Cassandra plugin for
> Maven" (which has the bigger fun of using two Apache marks...)

We still need to "git grep 'Maven NAR'" the codebase and replace all
such language with the language mentioned above, instead.