Merge pull request #1 from purcell/patch-1

Fix typo in footer line
Version 1.0.1
Tune the keyword and comment colors in the light theme.
Change the dark theme highlight-block background colors.
Change the indentifier and delimiter colors.

The new colors are generated using CIELAB instead of HSV, so
the transitions should be much closer to how humans perceive differences
between colors.
Change the constant definition color in the dark theme.
Tune the built-in, function and variable colors.
Tune the dark theme function and variable color again.
Set the lightness and saturation for rainbow-identifiers.

This kind of configuration arguably belongs to the theme.
Make the variable color more distinct from the function color in the dark theme.