add -ljubatus_clustering to jubatus.pc.in
Merge pull request #665 from torash/bugfix/missing-ljubatus_clustering-pc

add -ljubatus_clustering to jubatus.pc.in
install core/clustering hpp files
Merge pull request #678 from jubatus/install-clustering-hpp

Install core/clustering headers
Merge branch 'master' into develop
bump version
Merge branch 'release/0.5.2'
Merge branch 'release/0.5.2' into develop
fix code style
bump RPM packaging version
Merge branch 'master' into develop
bump DEB packaging version
Merge branch 'develop' of https://github.com/jubatus/jubatus into develop
Use const reference in aggregators
Remove unused function
Merge pull request #688 from gintenlabo/fix-680

Use const reference for aggregator arguments (implements #680)