Removed unused rule
Updates for the new way of positioning the icon
One fix and one new feature

- fixed a bug where the calendar icon was in fact taking up space in
page; due to this I completely changed the way the calendar icon is
placed and hopefully I didn't brake it completely :)
- the date picker's "update" method is now automatically called upon
page resize and thus taking care of the case when the date picker is
attached to an element part of a fluid design
Updated version number to 1.8.2