Updated Chrome CSP

Updated Chrome Content Security Policy to allow Dropbox APIs
Consolidated Summernote dependencies

Relocated all Summernote JavaScript and dependencies (save JQuery) to
/summernote.
De-consolidated Summernote dependencies

Among other things:
- Redistributed Summernote dependencies to standard js, css, and fonts
folders
- Removed background.html and background page elements from extension
Fixed squares replacing Font-Awesome menu icons

Updated fonts from glyphicons to new fontawesome webfonts.
Added File API verification

Added check for browser support for HTML5 File API.
Added early version of local file input/loading--not yet functional:
file is selected, but webpage does not respond to the input change.
Redirected to CDN hosted dropins API

Removed internal link to js/dropins.js and relinked to hosted CDN copy
Moved text editor

Removed checkCS502x functionality.
Moved text editor to its own tab.
Replaced previous popup with a (rudimentary) menu solution.
Renamed Extension to 'Harvard Lecture Helper'

Renamed Chrome Extension.
Created secondary save.html canvas to allow copying of dynamic changes
made in Summernote. (Still testing!)
Tried (attempt 10) to get Dropbox Dropins API to work.
Note: dropins.js is broken; documented on Dropbox support website.
Actually renamed Extension

Forgot to include updated manifest.
ACTUALLY renamed the extension.
Removed href download tag

Removed flawed href download tag from notepad.html
Added working named download function

Added a functional download paradigm for named notes.
Added self-hiding elements for editing, saving, and downloading
Removed CS50 2x checking function...permanently (maybe not)
Merge remote-tracking branch 'origin/dropbox-save'