Adding PdoSessionHandler from Symfony project
Add PdoSessionHandler to lib includes
Add pre-install configuration and installation of sessions database
Add sessions.db to git ignore
Register database session handler, when DSN is configured
Wrap text in license file
Removed separate sessions database configuration, added option to store sessions in primary database
Added session tables to create_tables scripts
Added support for USE_DATABASE_SESSIONS option
Updated setup_database script to work for mysql
Removed sessions.db from gitignore
Updated reference statements to be compatible with mysql
Merge pull request #96 from jmfee-usgs/GMP-370

Gmp 370
Removed row class from observatory page(s). Change titles to be different and maybe a bit more appropriate.
Added basic navigation. Using navigation on each page.
Minimized styles to observations list.
Added class to observation based on review status. Added basic styles for classes.
Changed link to button. Stopped re-displaying observatory name at top of list (this is now shown elsewhere).
Changed layout for view. Converted list of observatories to a select box. Updated functionality and code as required to work.
Updated tests to work with new markup.