Added option to persist map location via url hash

Will help with https://github.com/agrc/land-mobile-radio/issues/4

Also upgrade esri api to 3.11 and fixed minor typo in gruntfile.

@steveoh Will you take a look at this?
Cleaner URL's. Bert requested it on Broadband and I thought that it made sense. No sense in doubling the length of the query by adding a bunch of decimal places.