Wrap drawImage calls to check that the image has a width (and therefore loaded).  Fixes IE.
Fix IndexSizeError when turtle is moving backwards
Merge pull request #490 from code-dot-org/wrapdraws

Bounds-check drawImage calls (ensure positive width and non-negative offsets)
WIP to get pattern images loading and showing on IE10.
Automatically built.

commit 75148ff545b8d95a82d8a0409b6a983804f0fa25
Merge: eb40c63 4a039ea
Author: Josh Lory <josh.lory@code.org>
Date:   Wed Nov 19 10:28:02 2014 -0800

    Merge pull request #490 from code-dot-org/wrapdraws

    Bounds-check drawImage calls (ensure positive width and non-negative offsets)

commit 4a039ea163ca28e2c1413d46ce6471bebde70548
Author: Josh Lory <josh.lory@code.org>
Date:   Wed Nov 19 10:23:11 2014 -0800

    Fix IndexSizeError when turtle is moving backwards

commit e77d1566923c6fd5dd02a7386c0785a5b86a1184
Author: Brendan Reville <brendan@code.org>
Date:   Wed Nov 19 09:28:01 2014 -0800

    Wrap drawImage calls to check that the image has a width (and therefore loaded).  Fixes IE.
Make pattern loading work on IE10.
Attaching patterns to a display:none div in the DOM was causing IE10 to set the image width to 0,
preventing us from drawing it onto the canvas.
Code review feedback.
Fix braces.
Merge pull request #491 from code-dot-org/patternie

Make pattern loading work on IE10.
Automatically built.

commit 52f453359f1e5130796f4dad0e4b3396fe817df4
Merge: ba1a5b6 921510c
Author: breville <breville@users.noreply.github.com>
Date:   Wed Nov 19 11:22:21 2014 -0800

    Merge pull request #491 from code-dot-org/patternie

    Make pattern loading work on IE10.

commit 921510c1be1d2761b446752d78919ce5f6ec6708
Author: Brendan Reville <brendan@code.org>
Date:   Wed Nov 19 11:16:48 2014 -0800

    Fix braces.

commit 8f1ebac5cb9df0a6fbfc4678e51bb0c33fce9e91
Author: Brendan Reville <brendan@code.org>
Date:   Wed Nov 19 11:11:45 2014 -0800

    Code review feedback.

commit c2389f159738a3e7260eba039b9ef1719043272a
Author: Brendan Reville <brendan@code.org>
Date:   Wed Nov 19 10:55:07 2014 -0800

    Make pattern loading work on IE10.
    Attaching patterns to a display:none div in the DOM was causing IE10 to set the image width to 0,
    preventing us from drawing it onto the canvas.

commit ba1a5b6c97210969b5f67c9f43aeedd84d2bc24a
Author: Continuous Integration <dev@code.org>
Date:   Wed Nov 19 18:49:27 2014 +0000

    Automatically built.

    commit 75148ff545b8d95a82d8a0409b6a983804f0fa25
    Merge: eb40c63 4a039ea
    Author: Josh Lory <josh.lory@code.org>
    Date:   Wed Nov 19 10:28:02 2014 -0800

        Merge pull request #490 from code-dot-org/wrapdraws

        Bounds-check drawImage calls (ensure positive width and non-negative offsets)

    commit 4a039ea163ca28e2c1413d46ce6471bebde70548
    Author: Josh Lory <josh.lory@code.org>
    Date:   Wed Nov 19 10:23:11 2014 -0800

        Fix IndexSizeError when turtle is moving backwards

    commit e77d1566923c6fd5dd02a7386c0785a5b86a1184
    Author: Brendan Reville <brendan@code.org>
    Date:   Wed Nov 19 09:28:01 2014 -0800

        Wrap drawImage calls to check that the image has a width (and therefore loaded).  Fixes IE.
Merge pull request #492 from code-dot-org/staging

DTT