Added button to explicitly display the private key. This aims to prevent people from accidentally giving away their private key
When clicking the "display private key"-link the whole link container will be hidden instead of the the link only (to removed the padding of the container)
Fixed micro typo
Refactored the en- and decryption into a own class
Added support for file encryption.
As the openPgpJs libary can only be used with strings, I do a base64 encode of the files before encrypting them.
Added meta tags so people can better find it on search engines
Added support for importing existing private key
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	index.html
	js/appEvents.js
	js/appStorage.js