Guard against bad folder permissions when walking stats directory.
Update time series pathExpression when changing data so that those series work properly with functions using evaluateTarget (movingAverage, etc)
Merge pull request #356 from mattus/0.9.x-walkfix

Guard against bad folder permissions when walking stats directory.
Merge pull request #351 from fasterize/fix_getPercentile

Fix `functions._getPercentile` by ignoring None values
Merge pull request #366 from  kovyrin/path-expression-fix into 0.9.x

Make sure functions modifying time series update their pathExpression
Messaging middleware required by admin site as of 1.4
Merge branch '0.9.x' into HPC