TAJO-1004: UniformRangePartition cannot deal with unicode ranges.

Closes #116
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-906

Conflicts:
	tajo-jdbc/src/main/java/org/apache/tajo/jdbc/MetaDataTuple.java
	tajo-storage/src/main/java/org/apache/tajo/storage/FrameTuple.java
	tajo-storage/src/main/java/org/apache/tajo/storage/LazyTuple.java
	tajo-storage/src/main/java/org/apache/tajo/storage/Tuple.java
	tajo-storage/src/main/java/org/apache/tajo/storage/VTuple.java