Allow LogConfiguration to be used with GWTMockUtilities.disarm()

Also fixes a small error in HtmlLogFormatter.

Fixes issue 8050 and issue 5447

Change-Id: Ia52e4ce2dcd2f4c750534d53bcb17cd842b87e69
Review-Link: https://gwt-review.googlesource.com/#/c/2111/

Review by: mdempsky@google.com
Introduces a common SerializableThrowable as public API.

Change-Id: I98ae52858d87b6ac4a0c844464b25540be454942
Review-Link: https://gwt-review.googlesource.com/#/c/2160/

Review by: skybrian@google.com
Refactors StackTraceDeobfuscator to gwt.core.impl with some clean-ups.

This is going to be used from gwt.junit.

Change-Id: I97eafa571fcc597a8a03b8dae4bfc17ea0462e85
Review-Link: https://gwt-review.googlesource.com/#/c/2131/
set target and source level to 1.6 for JSP compilation

Using JSP pages with syntax features > java 1.4
running in dev mode (embedded jetty) caused compilation
errors. This patch sets the default level to java 1.6
while still allowing the user to set a custom compiler
level.

fixes issue 3557

Change-Id: Idd3d751c5eb2008a7a1e51536580d56a0fb3603f
Review-Link: https://gwt-review.googlesource.com/#/c/2201/

Review by: skybrian@google.com
Add a /policies/ directory to Super Dev Mode code server.

GWT-RPC serialization policy files are now published as URL's like this:

/policies/{strong name}.gwt.rpc

For human consumption, a bare-bones index page at "/policies/" lists all GWT-RPC policies currently available from the code server, with a link to the source of
each service interface and the policy file.

(The plan is to add an option to RemoteServiceServlet to allow policy files
to be loaded from a code server using HTTP.)

Change-Id: I06b8ab651ee1a5fde20b534eb60294bcfc72d10e
Review-Link: https://gwt-review.googlesource.com/#/c/2200/

Review by: mdempsky@google.com