Change login.inc.php define to CurrentUser, add empty CurrentUser for require build process
Add CurrentUser to require build process excludes
add static getCurrentUser method, define CurrentUser in test harness, update user defaults and tests based on schema
Remove unused UserRole class
Update ObservationView to use User.getCurrentUser()
exclude scss from requirejs copy, update cssmin to minify all .css files
Merge pull request #118 from jmfee-usgs/GMP-386

Gmp 386
Add sqlite, mysql drop_tables scripts
DatabaseInstaller class, with sqlite and mysql implementations
Updated setup_database script to support recreating schema without dropping, reference load_bns script for data loading
Merge pull request #122 from jmfee-usgs/database-installer

Merged.