PluginUtils: Fix a small bug introduced at 8afb5b3c (10-05-2013!) making all 'int' NeptusProperties not to be loaded properly.
(Not sure why in some cases a string was detected for numerical property... "if(className.equals("java.lang.String"))")
PluginUtils: Style cleanup and removed 'else if' to just else otherwise it will not be loaded. (Previous commit related.)
Merge branch 'release/neptus-3.0.x' into release/neptus-3.1.x