Fix a minor error with the Projectile Hits event

Arrows: Powered by dark magic.
Add ItemPlantgrowth property

Plant growth is currently handled rather poorly by Bukkit...
nonetheless, here's a working property for it!
Automatically add plugins and execution jar in RuntimeCompiler

For some reason, it won't let you actually compile any .java files.
Merge branch 'master' of https://github.com/Morphan1/Denizen
Fix meta errors
Add ItemBook property

After trying to figure out how to make the book info work without
creating weird errors with the pipe symbols and newlines, I decided to
use an HTML-style escape system for book meta.
Works extremely well!

- Also, fix some errors in RuntimeCompiler.
Add speed argument to the shoot command

Because the default physics aren't all that impressive... shooting in an
arbitrary direction and speed is useful.
Calculate particle effects correctly

the Effects enum sometimes acts like it has effects it doesn't... no
idea what's going on there, just give it a lowered priority under
ParticleEffect for now.
Merge pull request #568 from mcmonkey4eva/master

More fixes