bug #14 Added a backward compatibility for `skipTest` method for python 2.6 (alquerci)

This PR was merged into the 1.1-dev branch.

Discussion
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Added a backward compatibility for `skipTest` method for python 2.6

| Q               | A
| --------------- | ---
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Tests pass?     | yes
| Related tickets | #11
| License         | GNU GPLv3

Commits
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79de823 Added a backward compatibility for `skipTest` method for python 2.6