Quick fix for "buycraft.net" updates

• Disabled gzip encoding which wasn't properly supported in the plugin. Thanks to @VonHirsch in #16 for fixing the issue.

Fix for PocketMine changes

• Fixed a segfault which occurred when executing certain asynchronous tasks on new PocketMine builds. This is a hacky temporary fix and it hopefully will be improved in the future.
• Added debugging tools to make finding API issues faster.

Fixed BuyCraft API issues

• Temporary fix to the BuyCraft API issues, I will document the fix further on my blog.
• Refactored cURL requests to be encapsulated in an HTTPUtils.

Fixed class loading issue

• Fixes class loading issue which prevented anything from working properly. Thanks to @kennethgomad01 for reporting this issue.

Fixed major memory leak.

• I fixed a major memory leak issue which would cause server instability or memory allocation crashes. This isn't a confirmed fix so if you still experience the issue just create an issue. Thanks to @iJoshuaHD for reporting this issue.

Added /buy and finished basic port.

• Added /buy and all associated functionality.
• Did some other improvements.

(There are still some known issues like the "requireOnline" bug)

More Async stuff...

• The pending users checker (which send requests every 2 seconds) now sends requests using an AsyncTask.

Suppress error when fetch fails.

• When an error happens during a fetch task (which can happen if the API is having issues) the error will happen silently and the plugin will retry.

Fixes slot counts & adds delay support

• Fixed slot counting
• Added support for delays
• Automatic delay of ten seconds on not enough slots
• Some more work trying to fix repeated execution (yes it still happens)

Added /buycraft info text.

• Added the info text to /buycraft that is available in the Bukkit version.