Added the missing frontend scripts for storage areas.
Changed the page alerts to display above page content.
Added Underscore.js as a client-side dependency.
Renamed the app.css to common.css.
Extended  `jquery.validate()` with `accept` rule.
Initial implementation of the storage areas maps.
Added info about the `var/uploads/` directory.
Implemented the storage areas map details page and text map markers editing.
Display an error message if the removal of map's markers failed.
Removed the excessive margin between the page body and footer on storage areas maps page.
Changed the marker deletion confirmation from `window.prompt()` to a Bootstrap modal.
Removed an unnecessary if condition.
Moved some code around.
Ensured that the storage area ID is returned as a string and not ObjectId.
Updated the readme.