updated to use sbt 0.12.3
ScalaTest should be used instead of JUnit.
ArrayIndexOutOfBoundsException in Tree.d_code
  * https://github.com/ymnk/jzlib/issues/9
  * fixed a bug in calculating the size of the pending buffer.
  * added a test case based on https://github.com/jglick/jzlib-9-demo
refactoring for improving the performance.
Merge branch 'AIOOBE_in_Tree.d_code' into dev
JUnit will not be used anymore.
bump version to 1.1.3
Merge branch 'dev'