Add Selection to Left Side

Add a bar that shows the selected document on the left side. Add new
color scheme.
Fix page_types

Change page_type to page_types.
Remove '#' Before Generate

The dot_grid gem is not expecting a '#' at the beginning of the color
string. Remove it before the generate.
Merge pull request #24 from slabounty/mark_selected_document_23

Mark selected document 23