separate include guard test and add duplication check
rename from include_guard.sh to check_include_guard.sh
Fixed namespace in operator<<().
Merge pull request #539 from gwtnb/unordered_map_namespace

Fixed namespace in operator<<().
Fixed to include correct headers in jubatus/util/data/functional_hash.h.
Merge pull request #527 from kmaehashi/auto-test-include-guard

separate include guard test and add duplication check
Merge pull request #540 from gwtnb/functional_header

Fixed to include correct headers in jubatus/util/data/functional_hash.h.
Use jsonconfig instead of json