Update lib-parent from 6 to 8.
Update lib-parent from 6 to 8.

The current lib-parent executes the FindBugs Maven Plugin that looks
for bugs using static code analysis. This is helpful because it avoids
bugs.

Some plugins are updated to the current version.

flatten-maven-plugin ................... 1.0.0-beta-3 -> 1.0.0-beta-5
maven-compiler-plugin .................................... 3.2 -> 3.3
maven-dependency-plugin ................................. 2.9 -> 2.10
maven-enforcer-plugin .................................. 1.3.1 -> 1.4
maven-jar-plugin ......................................... 2.5 -> 2.6
maven-javadoc-plugin ............................... 2.10.1 -> 2.10.3

wheelerlaw/system-rules,jdamick/system-rules,laurentleseigneur/system-rules