Delete unneeded Python files

Start of attempt #2
Revamp manifest to reflect new architecture
Humans.txt file to give credit where it is due
Put in custom settings page for sync time etc
Add icon19.png for Chrome icon
Lorem ipsum text for file list popup

Can be changed into full webpage later on if needed.
minor edit to humans.txt removing python
restructure directory heirarchy, add 'assets' and 'app' folder
remove unnecessary directories
remove unnecessary copy of 'dropbox-offline.png'
add dropbox SDK initialization and oauth
write function that fetches dropbox files and writes them to persistent filesystem
make it so data is actually written to file
poll server for test file every 5 seconds
fix minor parantheses bug
add fetch from dropbox function, decrease frequency of polling to twice per minute
fix minor bug in function fetchFileFromDropbox
Merge pull request #1 from adelq/develop

Develop