Add logo icon to login screen

Better ZK logo (still need a decent high res one)
Turned off autocorrect etc on the entry fields
Use a locally installed cordova to ensure correct version
Improve perceived performance

Fixes #36
Allow devgeeks.org and subdomains
Merge branch 'master' of github.com:devgeeks/Encryptr

Resolved conflicts:
	package.json
	www/index.html

Incorporating devgeeks' responsiveness (crypton-load-via-callback) changes.