use correct function for remove below data filter in js
Adding connectedLimit option, for specifying the number of consecutive None values to draw over when in connected line mode.
Adding support for an optional limit parameter to keepLastValue() which lets the user connect line segments with gaps of less than N datapoints.
Forcing colorList to be a string

When you pass a single color to colorList that is an integer (ex 646464),
it was giving the error "'int' object has no attribute 'replace'"
minor percentile related updates

* corrected removeAbovePercentile description
* corrected removeAboveValue description
* corrected removeBelowPercentile description
* corrected removeBelowValue description
* corrected removeBelowPercentile function mapping
* nPercentile perc_val test corrected
  * should return results, even if they are empty
* nPercentile name updated--it should match usage
added giraffe dashboard into tools documentation
added support for ceres-based back-ends for /metrics/index.json
whoops, fixed metrics/index.json output for ceres
Fixing a bug in the connected lineMode where a line would falsely be drawn from the top left of the graph area to the first datapoint.
add identity function
set pathExpression so that we can use this in diffSeries etc
add quotes to exactly match input name
Merge pull request #130 from rowanu/ceres_support

Ceres support for /metrics/index.json
Merge pull request #129 from kenhub/master

added Giraffe dashboard into tools documentation
Merge pull request #140 from richg/0.9.x-win

Minor changes for windows compatibility
allow hypens in the default input box validation

Closes issue #44
Allow any characters in axis labels

Closes issue #50
Require only one of whisper or ceres for install

Closes issue #86
Cleanup check-dependencies.py a bit

add python-rrd tool
be more gentle on messaging
Use %g instead of %f in most function labels

Closes issue #103