Use placeholder dimensions instead og canvas dimensions in calculations which fixes draw bug after introducing Retina support in Flot core

Removed implicit global variables in threshold plugin.

Cleaner and portable function to get pixelratio.

This patch is intended the make getPixelRatio function portable and cleaner :)

Previous indentation issue has also been fixed.

Thanks :)

Support different border color and widths for each side of the chart.

Edited grammatical error.

Added Szymon Barglowski, who originally reported the fmt variable.

Prevent insertSteps and fmt from becoming global.

`fmt` was being hoisted as a global variable.
Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>

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>

Added options to customize tilted pie shadows.

Fix makeCanvas for IE, broken by Retina support introduced in 179d2e1d.

Fixed a typo.

Update links to point to flotcharts.org.

Fix typo

Project links have changed.