When originally building Spina, I started off with some Backbone on

TypeScript tutorial that had imports from 'Backbone'. This worked fine

and I went with it. However, this was the wrong casing for the module,

which should have been 'backbone'.
The reason this wasn't caught is that I'm developing on macOS, which has

case-insensitive filenames. Likely, so was the author of the tutorial.

Upon using this on a Linux system, imports failed.
This change updates all imports and the TypeScript configuration to use

the correct casing for the module.

Successfully built this with lowercase backbone.
Verified that the new builds corrected build issues on Linux.