Better error handling. closes #1197

Squashed commit of the following:

commit 81d785980d3f3e4c1025f7b421f0ecb7320469f1
Author: Steve Heffernan <steve@zencoder.com>
Date:   Mon May 12 12:53:59 2014 -0700

    Removed unneeded comments

commit c7ad7322e49df9cb22665692dbfe615dfa44758f
Author: Steve Heffernan <steve@zencoder.com>
Date:   Fri May 9 14:29:31 2014 -0700

    Addressed comments in #1191
    Now clearing errors on loadstart events.
    Added some default error messages.

commit a742239d0e799fa6a5fee056cc37b3c2e3ab4510
Author: Steve Heffernan <steve@zencoder.com>
Date:   Wed May 7 15:38:31 2014 -0700

    Fixed the error display to hide by default

commit 561c3f844956db6f532cae8ed81a86cc39b10db1
Author: Steve Heffernan <steve@zencoder.com>
Date:   Mon May 5 10:44:47 2014 -0700

    Added support for displaying a message for the error.

commit 22142078427ead85548c4755bf1943a0a07b22b4
Author: Steve Heffernan <steve@zencoder.com>
Date:   Fri May 2 17:18:22 2014 -0700

    Updated spinner to hide on all errors

commit 95d7e7027467cf96b14db6692d93c7c7f41c5810
Author: Steve Heffernan <steve@zencoder.com>
Date:   Fri May 2 15:37:44 2014 -0700

    Exported ErrorDisplay

commit 11ca9cdd8db4d1559f5d1908c4e67be32ca7a25e
Author: Steve Heffernan <steve@zencoder.com>
Date:   Fri May 2 15:35:46 2014 -0700

    Updated flash tech to support new errors

commit 56cbe66f4233e54f13550367590864102f5de0fe
Author: Steve Heffernan <steve@zencoder.com>
Date:   Fri May 2 13:06:49 2014 -0700

    Started on better error handling and displaying in the UI when an error has occurred.

commit 740014c57b264079cf4084965a9384b49a7c0f64
Author: Steve Heffernan <steve@zencoder.com>
Date:   Wed Apr 30 16:11:33 2014 -0700

    Added better global log/error/warn functions.
    Added sinon.js for stubs in tests.
    Updated grunt version to satisfy peer dependency warning.