Implemented version Independent code
Added constant for tracker url.
Some variables didn't need to be static, they no longer are.
Added method and verifications for CraftBukkit class detection. The
plugin should now be compatible with all versions above 1_5_R01,
including MCPC.
Update for removal of static variables
Implemented version independent code.
With simple words, access CraftEntity and CraftPlayer invoke getHandle
and either gets the field "ping", "field_71138_i" or "lastPing" if it
exists and if none of the 3 are found disable the plugin.
Updated version and dependency version, removed CraftBukkit dependency