pfSense 2.4.x compatibility

Thanks to some pull requests and user remarks.

v0.48 Security release

This new release changes the old mysql queries to prepared statements improving security.
As a side effect, pfSense now needs the php56-mysqli package installed.

v0.46

Bugfix release with following improvements:

• Prevent autoconnect when no user data is asked at all
• Keep user entry when server validation fails
• Fixed an issue where terms of use where mandatory even if askForTermsOfUse = false
• Fixed a typo preventing terms of use validation string to appear
• Added spanish translation (thanks to joel.dq from Pfsense forum)

v0.44

Minor release with following changes

• Language can now be set on the fly with language=XX url parameter
• Language selection is possible for the end user via links on the login page
• When not sufficient user data is given, credentials are random generated