updated modules

- chai updated to 1.7
- mocha updated to 1.11
- sinon updated to 1.7
appended target for lint and fix
appended gemnasium badge
fixed description for README.md
rewrote unit test of mkrand
rewrote unit test of mktemp
appended test for private methods
added benchmark
appended npm-script for benchmark
changed to fast code
some changed

- changed from comment to doc comment
- changed function and exports
appended doc comments
some changed

- added lib/index.js
- appended export interface test
changed benchmark

- appended
- refactored
changed README.md
appended change to HISTORY.md
changed to version 0.3.1
release for version 0.3.1