Development Alpha 0.19.0

- MIGRATION: create_users_addresses_table
- MIGRATION: create_experts_table
- Users are now able to register to become Experts
- Added a 'Not willing to travel' option to the Travel Distance dropdown
on the Expert Registration form
- The address dropdown on the Expert registration now shows all
addresses associated with the user
- Addresses are now entered into the system during registration of new
users
- Changed Address, City, State & Zip to be required fields on the
registration form
- BUG FIX: Changed the default value of the id field in the global
optionsBegin() function to an empty string since 0 was considered a
valid option, which would break validation