Completed implementation of the delete snapshot.
Merge branch 'develop' of https://github.com/ozone-development/meridian into enhancement/22/deleteSnapshot
Updating datagrid and event counter to handle layer delete. Map layer bug fixed.
Fixing undefined errors found and managing layerOptionsCollection correctly.
Merge pull request #88 from ozone-development/enhancement/22/deleteSnapshot

enhancement/22/deleteSnapshot
Resolve merge conflict.