TAJO-1233: Merge hbase_storage branch to the master branch. (Hyoungjun Kim via hyunsik)

Closes #288
Add missed a commit log to CHANGES.
TAJO-1239 ORDER BY with null column desc miss some data. (Hyoungjun Kim via hyunsik)

Closes #299
Fix a wrong documentation link in user doc.
TAJO-1242: Json scanner can not read some case of trucated text. (jinho)

Closes #296
Fix the broken unit test of TAJO-1242
Fix the rat checking of TAJO-1242