restores the step where cyclopts looks for boost. It uses boost in Solver.h and Variable.h, so I'm not sure why the part of the build where cyclopts looks for boost was diabled.
gets rid of the program options linkage and works on my machine.
move license to its own file
updated readme to include boost dependency
Merge branch 'build_update'

Merges Katy's build updates and documentation.
moved license to a separate file
added coin's cgl library to the list of dependencies
Merge branch 'master' of github.com:cyclus/cyclopts
Update src/CMakeLists.txt

This correctly sets the rpath prefix for libcyclopts, which then ensures it is correctly found by libcycluscore.dylib and the cyclus executable on OSX-based systems. This accounts for the different dynamic library loading behavior unique to OSX.

Also replacing "dl" with ${CMAKE_DL_LIBS} in the TARGET_LINK_LIBRARIES command, as this is more OS-general.
Merge pull request #24 from sskutnik/patch-1

Update src/CMakeLists.txt to avoid relying on dyld_fallback_library_path.