Prompt before leaving unsaved reservations on page
Prompt before leaving unsaved reservations on page

fixes #1116 on github

kdeloach/nyc-trees,azavea/nyc-trees,maurizi/nyc-trees,azavea/nyc-trees,azavea/nyc-trees,kdeloach/nyc-trees,maurizi/nyc-trees,maurizi/nyc-trees,maurizi/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,azavea/nyc-trees,kdeloach/nyc-trees,kdeloach/nyc-trees