initial from_existing_window() glutin stuff

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+                 _                          _     _                _                 _ 
+  _____  ___   _| |__   ___ _ __ __ _ _ __ | |_  | |__   _____   _(_)_ __   ___  ___| |
+ / _ \ \/ / | | | '_ \ / _ \ '__/ _` | '_ \| __| | '_ \ / _ \ \ / / | '_ \ / _ \/ __| |
+|  __/>  <| |_| | |_) |  __/ | | (_| | | | | |_  | |_) | (_) \ V /| | | | |  __/\__ \_|
+ \___/_/\_\\__,_|_.__/ \___|_|  \__,_|_| |_|\__| |_.__/ \___/ \_/ |_|_| |_|\___||___(_)
+
+
+### Dependencies
+
+Circa June 2016, this requires a patched version of the `glutin` window
+creation library to allow re-using an existing X Window. This is only necessary
+for integration with X Windows, but the project won't build without it.
+
+As a workaround until there is a solution in upstream `glutin`, use the "dependency override" feature of the cargo build tool:
+
+  http://doc.crates.io/specifying-dependencies.html#overriding-dependencies
+
+Checkout the `feature-existing` branch from
+`https://github.com/bnewbold/glutin`, then, under this directory
+(exuberant-bovines), create a `.cargo/config` file with a path like:
+
+  paths = ["/home/bnewbold/src/glutin"]
+