Add passing amount and center over plotzoom event
Fixed overrun panRange while zooming
Pie: Whitespace cleanup, this file uses tabs for indentation
Pie: Allow to set shadow distance and alpha of a tilted pie
Whitespace cleanup in resizeCanvas()
Cleanup indentation in getPixelRatio()
Fix makeCanvas() for IE after Retina feature introduced in 179d2e1
Merge pull request #77 from julthomas/makecanvas-ie8

Fix makeCanvas for IE, broken by Retina support introduced in 179d2e1.
Added credits for further retina support fix.
Clarified version of master branch code.
Merge pull request #78 from julthomas/pie-shadow

Added options to customize tilted pie shadows.
Added credits for pie shadow options.
Converted implicit global variables to local variables
Adding component.json for bower.
insertSteps was being hoisted to global.

Locally declared insertSteps by adding var s.t. it would no longer be a
global variable.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
fmt hoisted to global.

`fmt` was being hoisted as a global variable.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
Merge pull request #851 from ncb000gt/master

Prevent insertSteps and fmt from becoming global.
Added credits for #851 global variables fix.
!selection.show => return null from getSelection

If we've called `clearSelection`, then calling `getSelection` shouldn't
return the old selection values. When calling `getSelection` before a
selection is made, `null` is returned. It seemed appropriate to do the
same if `selection.show` was falsy.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
Updated credits for #851 global variables fix.

Added Szymon Barglowski, who originally reported the fmt variable.