A couple of POM tweaks.

- bump compiler plugin to 3.1 and fix wonky arg passing
- bump lgo4j 2.0 depend to rc2
Javadoc tweak.

1.8 javadoc now freaks out about bare < and > in Javadoc. Yay!
A bunch more Javadoc fixes.

Wow, the 1.8 javadoc tool is much stricter. For the best I suppose, though
requiring a <caption> for a <table> seems a bit excessive.
[maven-release-plugin] prepare release samskivert-1.8