move platform codes to external
move platform serializers to external
move platform kvtests out of core
move pig kvtest into nativetask-pig
fix custom java comparator check
fall back to java output collector when secure shuffle enabled
Merge pull request #11 from manuzhang/check_secure_shuffle_flag

fall back to java output collector when secure shuffle enabled
move platform tests out of core
remove platform native codes from core
add back accidentally removed file
clean up platform native codes
cleanup platform java codes
implement native-pig platform
fix bugs in PigPlatform native codes
implement platform codes
fix bugs in platform native codes
fix bugs and add more failure infos in pig native test code
fix bugs in platform implementations
fix platform load bugs
fix uncaught classnotfoundexception in MapTask patch