updated readme's boost version
added a message to determine which libraries were being used
found out that boost has a installed called bjam. bjam has an option --layout which can take the form tagged. tagged adds -mt and -<version_number> to a library. if multithreading is on (which it is by default), it must find a library with the -mt tag. I was able to turn off multi threading for it to find the boost libraries installed in filespace/groups/cnerg/cyclus_dependencies. I'd like to leave the comment there for posterity. this set of commits closes #521.
fixes #521 by documenting newer boost requirement.