Added insert-synopsis
Added key-binding `C-c C-a` to insert synopsis
insert-synopsis will add to either scene or section heading
Added insert-synopsis and tips to README
insert-synopsis tests if current line is blank
Added backward-scene (forward-scene with negative n)
Updated README to include scene navigation
Merge branch 'insert-synopsis' into develop

Conflicts:
	README.md
Changed version number
Merge branch 'develop'

Conflicts:
	README.md