Changed the SIGTERM handler to not dump a stacktrace.

Review: https://reviews.apache.org/r/13028
Removed unnecessary sleeping from the test executors.

Review: https://reviews.apache.org/r/12781
Search frameworks & executors successively to save concat

Array.concat creates a new Array, which in this case is used once to
find frameworks and executors and then thrown away. Instead the Arrays
can be searched successively in place without allocating more memory.

Review: http://reviews.apache.org/r/13002
Remove HTML5 shim for <IE9

IE8 and below are officially no longer supported. The shim only loaded
in IE8 and below, and so it can be removed without affecting supported
browsers.

Review: http://reviews.apache.org/r/13005