Remove # prefix in RGB colors passed to colorList
Merge pull request #801 from kevinrobinson/patch/remove-hash-prefix-in-color-list

Remove # prefix in RGB colors passed to colorList
add squareRoot function, fixes #792
noticed that invert() was missing from the composer widget, refs #66
need to import math for test_squareRoot
jump to next iteration if None
Merge pull request #804 from obfuscurity/invert-widget

Add invert() to the composer widgets
Merge pull request #803 from obfuscurity/sqrt

Add squareRoot function, fixes #792