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 pull request #158 from tkunicki-usgs/master

modified objects to facilitate bsaeline distance calculation
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
fixed NSM WPS error
set for runtime 52N
Merge pull request #159 from jread-usgs/master

fixed the NSM object error (??) and set code for WPS run.
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
Fixed an issue with WMS caching layers even when resource has changes on OWS server. This affected shorelines and intersections
Fix for on-error during init - modal window was never appended to the body in order to show to the client
Made session clearing during on-init error more respectful of possible other session objects we probably shouldn't be deleting
Did a once-over to ensure any request to the session object is using it correctly
Split up disabled years per shoreline layer instead of grouped by all layers. This minimizes errors in the off-chance the user will have two shoreline layers up and have the same date in both and disables the date on only one layer but it registers on both layers both in view and calculations.

I am considering doing the same for the grouping column if the caps are different on the two layers, but the chance is very small, especially with future standardization of shapefiles and/or switching the date_ column to a date format
Merge pull request #161 from isuftin/master

Bulletprofing, WMS cache fix, Session clearing, Disabled-dates atomic to layer