#BKCommonLib for 1.8.8 
This version works with ViaVersion properly and ProtocolLib
Download from http://myles.us/ViaVersion/BKCommonLib.jar
If you don't want to compile
This is a library-plugin system, introducing a lot of utility classes It also simplifies coding:
- PluginBase: allows quick registering and monitoring of plugins being enabled
- (Async)Task: allows quick task starting and dynamic in-code creation
- Utilities for virtually every needed task ahead, from mathematics to obtaining an entity by UUID
- Custom node-based configuration extension
- BlockLocation, BlockMap and BlockSet to safely use blocks in maps and sets
- ItemParser class to generate a parser from user and use it during item transactions
- Nanosecond StopWatch class for performance monitoring
- Operation class to handle entities, players, chunks and worlds the way you want it
###License: Copyright (C) 2013-2015 bergerkiller
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.