TAJO-235: Support Oracle CatalogStore. (Jihun Kang via hyunsik)

Closes #154
Update Tajo site for 0.9.0 release.
TAJO-1121: Remove the 'v2' storage package.

Closes #203
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into index_support