Cleanup proxy packet injector in Spigot too. FIXES 127
More descriptive error message when an entities tracker is not found.
Add the ability to track the amount of time spent by each plugin.

ProtocolLib can now keep track of the amount of time spent by each 
listener (for each packet), generated as a report file. This is 
done in the new "protocol timings" command.
Attempt to handle snapshot versions by assuming Minecraft version.

The snapshot version contains a release date, so we'll simply compare
that against a known release date of a Minecraft version. It it's 
later, we know it is at least a minor version above, and vice versa.
Experimental: Correct a possible race condition with Spigot.
These fields will be updated and read from different threads.

Mark them as volatile just in case.
Version 1.6.4 is working fine.
Bumping to version 2.7.2
Correct all JavaDoc problems.
Fix a critial bug that prevents PB from loading. 

This was caused by a previous patch that corrected the version parser 
for special Spigot versions with a snapshot protocol enabled. 
Unfortunately, this also causes the comparer to fail on normal 
version ...

Somehow, that got through testing.
Bumping to version 2.7.3
Added a simple integration test to ensure ProtocolLib actually works.

We do this by running a CraftBukkit server in target/server, and 
copying ProtocolLib to its plugin folder.
Add a timeout to server startup and the ping test.
Add the test plugin to the plugin manager, just in case.
Make UnknownHostException more low-key. They are to be expected.

Whenever the update procedure is ongoing, and the server temporarily 
lost connectivity to the internet (or more likely, dev.bukkit.org is 
down), a huge exception log will be printed in the console. See ticket
134 for a real life example.

This is completely out of propotion to the problem at hand (connection
problems), so we will replace the error log with a simple warning 
message.
Add a small hint for plugin authors to the "unknown origin" error.
Update to the latest version of Gravity's Updater class.
Increment to 2.7.4-SNAPSHOT
Remove spigot listener when the plugin is disabling.
Ignore fake players in MCPC++