Upgrade versions

- jclouds from 1.5.2 to 1.5.4
- surefire from 2.12.3 to 2.13
- ant from 1.8.2 to 1.8.4
- testing from 6.7 to 6.8
- mockito from 1.8.4 to 1.9.5
- removed spring version (unused)
Merge pull request #435 from aledsage/upgrade/versions

Upgrade versions