Upgrade to FishEye 2.9.1

Now we are on 2.7
2.8 - variety of social features as well as performance improvements
2.9 - performance improvements, simplified linking with JIRA (no explicit links between JIRA projects and FE repositories necessary, leads to simplified administration)

https://confluence.atlassian.com/display/FISHEYE/FishEye+2.8+release+notes
https://confluence.atlassian.com/display/FISHEYE/FishEye+2.9+release+notes