Merge branch 'release/0.0.3' into develop
Report replace string error
Support capture group in onig_filter
Remove spaces
Merge pull request #57 from unnonouno/re2-replace-error

Report replace string error
fix classifier_factory to report error when parameter block is missing (fix #52)
Merge pull request #56 from unnonouno/onig-replace

Support capture group in onig_filter
Merge pull request #59 from jubatus/fix-52

fix classifier_factory to report error when parameter block is missing
bump version
Merge branch 'release/0.0.4'