Add minimal configuration for running `gradle compileJava`
Add configuration for making jar with `gradle jar`
Add support for eclipse to gradle.
You need to generate .project and .classpath files with `gradle eclipse
Add configuration for `gradle test`.
You need to generate image data with BitmapRenderer#main and GenerateExpectedImages#main.
Fix tools.jar location for OS X.
Add wrapper.
Fix for newer OS X.
Reduce number of get invocation.
Replace Iterator with Iterable if possible.
Remove multiple invocation of removeDuplicateSets.
Replace System.out with java.util.logging.Logger.
Remove unused option.
Add logfile option.
Extract option defining into a method.
Rewriting CellTagPair processing in a bit concise way.
Extract boundary finding method.
Fix merge failure.
Add only non identical CellSet from last one to boundarySetsStep2.
Reuse copyGrid.
Remove trivial method.