Updated session management a bit -- we need to hammer out what we will be doing with sessions

Added ability to remove baseline on buttonclick
trying to refactor sessions - holy b'jeezus is it a mess
Merge remote-tracking branch 'upstream/master'
Session clearing functionality moved to the sessions object
Changed session accessor methods to more closely match their functionality

Removed the session object from the UI object for now
Sessions working for shorelines - major refactor incoming
Baseline functionality properly working
Merge remote-tracking branch 'upstream/master'
Most of the functionality that was functioning previous to refactor is working again - transect editing still needs work
Merge pull request #160 from isuftin/master

Session object refactoring - code cleanup needs to happen now