GUI updates, tabs, modals added

This is the shell for the new gui. work still needs to be done
to make functionality dynamic and operational.

Conflicts:
	network-settings-ui.php
	wordpress-cas-client.php
Re-structured code

Divided client and server code into different files.
Renamed files
Resolved #52
Resolved #39 - For single sites the password will now be encrypted and
stored in the database.

Conflicts:
	network-settings-ui.php
	wordpress-cas-client.php
Merge branch 'dev' of https://github.com/TriptiSharma/wordpress-cas-client into tripti-pull-54

Conflicts:
	cas-client-ui.php
	js/cas-client.js
	wordpress-cas-client.php