add Json.keys()
Merge pull request #369 from nikuuchi/json

add Json.keys()
Merge pull request #368 from wakamori/fix_shell

fix Syntax.ShellStyle package
remove test/0006_Script
fix KClass compareTo API
fix OutputTest module
remove compiler warnings
fix StringInterpolation pacakge
refactor CMakeLists.txt
fix build error with llvm-2.9
fix compiler warnings at posix.socket package
fix a bug of getting return code