v0.3.0 release

1. add support for post to http://127.0.0.1:1988/v1/push
2. fix cpu/mem usage percent calculate.
3. metrics add docker prefix

bug fix release

1. fix bug for iostat metric collect.
2. add Makefile and code validate func.

first release for docker-metrics

v0.1.0

update FileExists func and add one test file.