iD 1.1

This updates iD to 1.1.0rc1. Here's the message I [posted to talk@](http://lists.openstreetmap.org/pipermail/talk/2013-July/067765.html):

> This release focuses on relation editing support and performance improvements. The relations that each feature is a member of are displayed in the sidebar, and when a relation itself is selected, it's members are displayed. You can also search for relations via a new search interface, add and remove memberships, and create new relations.

> We made performance improvements across the board, focusing on load time and editing performance in dense areas. For example, while iD 1.0.1 on Firefox takes 50 seconds to load a [dense area like this]( http://www.openstreetmap.org/edit?editor=id&lat=49.969975&lon=8.837839&zoom=16), iD 1.1 loads it in 20 seconds. In some cases, improvements were limited by native browser performance bottlenecks, but we are seeing some progress by browser developers in eliminating these as well.

> A detailed changelog is available [here](https://github.com/systemed/iD/blob/master/CHANGELOG.md).

> As always, the best place for feedback and bug reports is  [the GitHub project](https://github.com/systemed/iD/).

In addition all the changes and additions in iD itself, I've updated the OSM.org stylesheet so that OSM.org's left sidebar is hidden when editing with iD. It took up valuable editing space, especially now that iD has a persistent sidebar of its own, and the most valuable feature it provided -- search -- is integrated into iD itself in 1.1.