Catalog update for checkstyle, pmd and findbugs connectors

Tested with versions:
m2e 1.0, 1.1, 1.3, 1.4 
eclipse 3.6, 3.7, 4.2, 4.3
pmd 4.0.0
checkstyle 5.2, 5.3, 5.4, 5.5, 5.6
findbugs 2.x