[Tajo Wiki] Update of "Roadmap" by HyunsikChoi

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The "Roadmap" page has been changed by HyunsikChoi:
https://wiki.apache.org/tajo/Roadmap?action=diff&rev1=12&rev2=13

  
  ||ISSUE NUM||Description||Completed||
  ||[[https://issues.apache.org/jira/browse/TAJO-176|TAJO-176]]||Add JDBC driver ||O||
- ||[[https://issues.apache.org/jira/browse/TAJO-122|TAJO-122]]||Add EXPLAIN clause|| ||
+ ||[[https://issues.apache.org/jira/browse/TAJO-122|TAJO-122]]||Add EXPLAIN clause||O||
- ||[[https://issues.apache.org/jira/browse/TAJO-283|TAJO-283]]||Add Table Partitioning||V||
+ ||[[https://issues.apache.org/jira/browse/TAJO-283|TAJO-283]]||Add Table Partitioning||O (still buggy)||
  ||[[https://issues.apache.org/jira/browse/TAJO-16|TAJO-16]]||Allow Catalog to access HCatalog||O||
  ||[[https://issues.apache.org/jira/browse/TAJO-135|TAJO-135]]||Upgrade Hadoop to 2.2.0||O||
  ||[[https://issues.apache.org/jira/browse/TAJO-316|TAJO-316]]||Support outer joins||O||
  ||[[https://issues.apache.org/jira/browse/TAJO-200|TAJO-200]]||Support binary/text (de)serializer of RCFile, allowing Hive compatibility||O||
  ||[[https://issues.apache.org/jira/browse/TAJO-317|TAJO-317]]||Improve Tajo's Resource Manager ability, enabling disk-based and memory-based resource scheduling||O||
  ||[[https://issues.apache.org/jira/browse/TAJO-292|TAJO-292]], [[https://issues.apache.org/jira/browse/TAJO-374|TAJO-374]]||Improve the intermediate data materialization method.||V||
- ||[[https://issues.apache.org/jira/browse/TAJO-291|TAJO-291]]||Implement the push transmission type.|| ||
+ ||[[https://issues.apache.org/jira/browse/TAJO-291|TAJO-291]]||Implement the push transmission type.||X||
  
  == 1.0-alpha (expecting, not determined) ==
   * Improve fault tolerance