#475 Updated Maven project settings to those applied by m2eclipse.

• Updated Maven project settings to those applied by m2eclipse, where possible.
• common.raildiagrams is an Eclipse plug-in, rather than a Maven project. It will have some changes, but now only in .classpath. The two worlds collide here. May have to revert the changes from time to time after updating it as a Maven project. Don't think this can be avoided.
• Set Java '--release' option. Prevents using unavailable Java APIs. (m2eclipse sets this option as well)

Closes #475 (closed)