Add IE11SandboxEscapes source

It's just the source code for the IE11SandboxEscapes from James Forshaw. I've done a pull request for the source code because it includes source for four different sandbox bypasses. 

This slightly modified version of the Project modifies CVE-2014-0257 and CVE-2013-5045 to work with the metasploit modules: 

https://github.com/rapid7/metasploit-framework/pull/3403
https://github.com/rapid7/metasploit-framework/pull/3404. 

It keeps the code for the other two sandbox bypasses, even when they won't build by default in the msf project (I've modified the solution properties). 

At this moment I've just ported CVE-2014-0257 and CVE-2013-5045. But maybe someone else would like to give a chance to CVE-2014-0268 (needs java in the target) and CVE-2013-5046 (I've not managed to make it work across different browser versions to deploy meterpreter still, maybe in the near future :) ).

**IMPORTANT**: The original code by James is GPLv3. This pull request tries to respect this license, please check carefully everything is in order before landing it.

**IMPORTANT 2**: In order to #3403 and #3404 to work https://github.com/rapid7/meterpreter/pull/84 must be landed first, and the meterpreter binaries updated.