Allow ERB whitespaceless tags to be used

Setting the trim mode to '-' means the `<%-` and `-%>` tags can be used to prevent whitespace/newlines in the output.
Introduce explaining variables to describe colors in the console2 template

This makes it easier to see the which console2 color is mapped to each base16 color.
Merge branch 'refactor_console2_template' into console2_256_color_changes
Standardize console2 256 template

Replaced template with console2 standard template, but replaced bright
colors with normal equivalents (this is consistent with the iTerm2
templates). This does change the colors that the orignal author of the
256 template chose, but it's more consistent with base16.
Merge branch 'console2_256_color_changes'