Updated site's links and controbutors' organization.
TAJO-273: NotEval incurs NPE with boolean column. (hyunsik)
TAJO-270: Boolean datum compatible to apache hive. (jinho)
TAJO-277: Infinite loop occurs when a table is empty. (jinho)
Updated the instruction and information of building.txt and readme file.
TAJO-278: Add ASF License 2.0 header to *.jsp and web.xml files. (hyunsik)