Use nuget to get cecil rather than storing the binaries in the repo. Fixes #284
Added license files for ikvm, monolinker and cecil. Added usage instructions for monolinker.
Tools now go to the Binaries/Tools/[Debug|Release] directory. OpenTK remains at BInaries/OpenTK/[Debug|Release]. Mono.Cecil and IKVM now reside under the Dependencies/managed/ directory.