Fix: Ensure push_tags works with git 1.7.1 on CentOS

This fixes #144
Docs: Use 'reset' instead of 'load' in testing section

Load was left over from a previous commit.

See https://github.com/Gazler/githug/pull/123
[Contribution] New level
Merge branch 'master' of https://github.com/Gazler/githug

* 'master' of https://github.com/Gazler/githug:
  Docs: Use 'reset' instead of 'load' in testing section
  Fix: Ensure push_tags works with git 1.7.1 on CentOS
Merge branch 'master' of https://github.com/martinmose/githug

* 'master' of https://github.com/martinmose/githug:
  [Contribution] New level
  Add level
[Contribution] New level