Add a CEF_ENABLE_SANDBOX define in cefclient and cefsimple to make disabling the sandbox easier for non-VS2010 builds of the binary distribution (issue #524).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1546 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Update the CEF logo image in cefclient.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1548 5089003a-bbd8-11dd-ad1f-f1f9622dbc98