new title format option and syntax highlighting
new date strftime option
new commands to pin/unpin notes
Merge pull request #57 from insanum/hotness

New title format option, strftime option, pin/unpin commands, and syntax highlighting

- Allows you to specify the format of title strings in the get_note_list view (indicate pinned, markdown, etc)
- Allows you to format the time/date in the get_note_list view
- Allows you to pin/unpin the currently open note
- Adds syntax colour highlighting to the get_note_list view (requires vim with +conceal)