Add cURL to the recommended php extension list
Doctrine conversions, and Bcrypt ("Blowfish") password encryption.

Doctrine conversion for kernel objects, model class and intertwined changes.
System module schema changes to fix various issues and accomodate new password hash.
Installer tweaks for doctrine compatibility and increased db independence.
Add ircmaxell/password-compat library in composer.json to support php5.5 style password_hash() and password_verify() calls in pre 5.5 systems.
Core, but not all included modules, now installs and runs on SqLite. Issues remain with duplicate index names.