Upgraded FileUtils

Added: FileUtils now provides a download method for downloading files
and storing them locally.
Fixed: FileUtils now closes every connection or stream it opens
correctly.
Housekeeping

Fixed: Some spelling issues.
Removed: There is no longer a toString() method avaiable in the
QuarterBukkit plugin class (it was kind of pointless).
Fiexed: You can now retrieve the QuarterBukkit object using the static
QuarterBukkit.getPlugin() method without casting.
ServerMods-API Query API

Added: The query API can be used for querying the official server-mods
api (https://api.curseforge.com/servermods) and parsing the avaiable
data without much effort. It also uses a new config option for setting
the optional api key.
Removed Updater

Removed: Because the query API is so powerful and the FileUtils class
provides quick file operations, you can now write your own updater fast,
so we don't need the "bad" and too complex updater framework.
Note: You can still use the InstallException in your own updaters.