Reflect the change of the repository name

This assumes that the pull request will be merged just before or after
renaming the repository from 'maven-nar-plugin' to 'nar-maven-plugin'
as per the convention that 'maven-*-plugin' names are reserved for
the special plugins that Maven Central controls.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Rename the groupId

In the same spirit as renaming the plugin from 'maven-nar-plugin'
to 'nar-maven-plugin' as per the convention that only Maven Central
plugins should follow the 'maven-*-plugin' (some plugins are more
equal than others), we also follow the convention to use a groupId
that we 'control'.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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 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...)
Complete the 'Maven NAR' -> 'NAR' renaming

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Change groupId to com.github.maven-nar

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Rename the packages

Since '-' is not a valid part of a package name, we use
com.github.maven_nar instead of com.github.maven-nar, as per
http://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'name-change' of git://github.com/scijava/maven-nar-plugin

This is the big name change discussed for a long time already: the NAR
plugin no longer aims to become the "Maven NAR plugin", i.e. a core part
of Maven endorsed by the core Maven developers.

This merge completes that move by fixing all mentions of the "Maven NAR
plugin" and changing the groupId as well as the Java packages
accordingly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>