Add support for multiplySeriesWithWildcards
Fix multiplySeriesWithWildcards help message
Merge remote-tracking branch 'upstream/master'
Added test for multiplySeriesWithWildcards
Fixed blank line lint error
Don't duplicate the static prefix
Merge pull request #974 from brutasse/fix/static-prefix

Don't duplicate the static prefix
Make HTTP clients only cache graphs as long as we keep them in memcached

We were previously setting Cache-Control: no-cache and Pragma: no-cache
without setting any Expires or Last-Modified headers. This was causing
some clients (e.g., WebKit on iOS) to cache images indefinitely.

We now set Expires, Last-Modified, and Cache-Control: max-age to tell
clients to cache images for as long as we cache them in memcached. If we
aren't using memcached, we tell clients not to cache the images at all.
Merge pull request #978 from aroben/expire-cached-images

Make HTTP clients only cache graphs as long as we keep them in memcached
Register "grep" as a render series function

When using the function grep(series, pattern) the following error is reported:

 KeyError at /render/  u'grep'

The fix is to register the keyword "grep" with the existing grep function in the SeriesFunctions dictionary.
Merge pull request #981 from nzlosh/patch-1

Register "grep" as a render series function
Merge pull request #634 from fhossain/master

Add multiplySeriesWithWildcards
Merge branch 'master' into delay