First packaged basho_bench

Through the effort to make smaller package, several changes to the
code and dependent modules were done:

- dependent modules updated; lager, mochiweb and getopt
- some dependent modules removed; erlcql, velvet, casbench
- deprecate R15

Andalso, there are some kludge to enable package install with node_package;

- not using escriptize but just a proxy script installed
- unnecessary directories like log, data created
- unnecessary user and group named basho-bench created for this
- not pinning dependent module versions yet