Added checkboxes in options to enable/disable things instead of selecting 0 to disable
Cleaned code up to store 0 instead of using a separate variable to disable - retains compatibility with previous settings
Modified colourisation to ignore asianness < 0
fix options checkbox bugs

reset background updating interval dynamically
fix bug that made HAC_HTML.colorize depend on asianness_on being set to
true
slide in/out instead of fade in/out options DOM
set default nonzero spinbox values if colourisation or refresh is
disabled
Merge pull request #15 from xsznix/options_checkboxes

Options checkboxes: adds checkboxes to intuitively enable/disable grade colourisation and background updating
add survey link, refactor ad generation code, increment minor version number
add changelog for 1.2.6
add credit to Tristan, update minor version number
add color schemes, add class grade caching
add overview file
move globals to top
change options page layout slightly
fix merge conflicts