Merge pull request #25 from ssOleg/develop

Updated documentation for ZEN-9211 issue
Merge pull request #139 from ssvsergeyev/develop

Fix for 9312, 8598, 9211, 10870
Further reduce perfmon collection gaps.

Fixes ZEN-10600.
Catch exception instead of InvalidTalesException.

It turns out that InvalidTalesException wasn't introduced until Zenoss
4.2. Catching Exception is less specific, but at it works on all
supported versions of Zenoss.

Fixes ZEN-10992.
Merge pull request #146 from zenoss/feature/ZEN-10992

Please review branch feature/ZEN-10992
Merge pull request #145 from zenoss/feature/ZEN-10600

Please review branch feature/ZEN-10600