add Json.keys()
fix Json.keys() test
Merge pull request #349 from myoan/stable

add Json.keys()
add ResultSet.getBoolean()
Merge pull request #351 from nikuuchi/sql

add ResultSet.getBoolean()
fix build error
rename KKMethodName_ => KMethodName_
fix build error
add libevent to 'stable branch'
patched from ide-san
delete libevent_event_glue.c
delete comment out line