Remove Boost and move to Chaiscript 5.1

I have updated the project files so that we (optionally) make use of C++11

In the process I've removed all our dependences on boost (via ChaiScript) by upgrading to ChaiScript 5.1

The install documentation (for Mac OS X and Windows) has been updated and simplified.  However the Linux install documentation still need to be updated... However should keep on working as before.

This pull request still needs testing... But is functional.

Cam.