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
Print log when error occurred during forwarding requests
Eliminate ADL (which is evil) from test of lof_storage
Add test for issue #721
Clear model before unpacking
Add dummy clear for clustering
Clear all model before deserializing, not on deserializing
Modify classifier_test
Merge pull request #735 from gintenlabo/clear-model-before-loading

Clear model before loading (fixes #721)
Merge pull request #733 from rimms/proxy_with_logging

Print log when error occurred during proxy is forwarding requests