add more test on driver::nearest_neighbor
print version number on mixing
indents were mistakenly modified
test ok
add some test
indentation was mistakenly modified
adjust to cpplint
similar_row and neighbor_row should return the same rows
versions should be output in MIX slave's log too
use `server_ip` and `server_port` instead of `ip_` and `port_`
Merge pull request #649 from jubatus/feature/print_model_version

Print versions of models in MIX log
Fix cpplint
Fix datum in nn driver test
Merge pull request #652 from jubatus/test/more_test_nn_driver

more test in driver::nearest_neighbor
Remove code for benchmark
Remove csize_t
Reformat clustering
Fix code style