Remove free_long and free_double
Fix code style
Write compressive storage test
Increment forgetting weight all of when carry up occurrs
Set forgetting_threshold in test
Modify behavior of remove_row of lsh_index_storage before/after MIX.
Merge remote-tracking branch 'upstream/develop' into remove_free

Conflicts:
	jubatus/core/clustering/kmeans_compressor.cpp
Remove unnecessary serialize method
Refactor
Use partial_sort
Fix jubatus servers to stop mixer before RPC server stopped

fixes #730
Merge branch 'develop' into fix-681 and fix misses
Merge pull request #725 from jubatus/fix-681

Modify behavior of remove_row of lsh_index_storage before/after MIX.
Update ChangeLog for 0.5.3
bump version
Merge branch 'release/0.5.3'
Merge branch 'release/0.5.3' into develop
bump DEB packaging version
Merge branch 'master' into develop
bump RPM packaging version