ChunkManager implementation

ChunkManager optimize chunks handling in small and big worlds

Small worlds gets benefits with using int-object map instead long-object (in area -32768...32767 by x and z)

Large worlds gets benefits by using efficient map by Colt project, which a little (3-6%) slower in writing, but greatly faster
(400-500% from Java's HashMap and 150-180% from Trove's maps) on reading.

build.gradle

@@ -144,6 +144,7 @@ dependencies {
     libraries 'net.minecraft:server:1.7.10'
     libraries 'pw.prok:KImagine:0.2.0@jar'
     libraries 'org.apache.httpcomponents:httpclient:4.4.1'
+    libraries 'colt:colt:1.2.0'
 }
 
 packageUniversal {