Allow default mapping to be overridden.
Don't perform default mapping if `<Leader>ig` is already mapped.
Only check normal mode for existing `<Plug>IndentGuidesToggle` mapping.
Setting foreground colors with respect to background
Merge pull request #40 from sergey-vlasov/master

Foreground color fix for special characters
Process autocmds after loading the colorscheme.
Trigger BufEnter and process modelines after loading the colorscheme.
Add option g:indent_guides_exclude_filetypes.

For specifying a list of filetypes to disable the plugin for.

Closes #20 and #26.
Fix comment.
Update license in the doc.
Disable the plugin when in a diff.

Closes #48.
Bump version and update the doc.