Refactoring

- Preparation for addition of Cisco hotspots support
- Removed invalid credentials (server no longer contains bug)
More refactoring

- Moved login checking outside ArubaClient
Detect network type by SSL certificate name
Initial commit for CiscoClient
Use http for captive portal checking

Cisco-based systems do not support https redirect
Full support for cisco network
Simplify logging
Use optimizing proguard configuration

The non-optmized version does not remove Logging
Bump version to 0.5.1
Support IC-WiFi

Uses aruba portal similar to MU-WiFi
Bump version to 0.5.2