Target dependencies

[danhedron]

Building Magnetite is a bit crazy since it's currently targeted at "whatever version of the library is in the arch repos" which is not helping since SFML2 is still under active development.

I'll have to add submodules for the dependencies that are hosted on git, and give version numbers for the other packages which shouldn't be a problem since they are relatively stable.

[Encryption767]

Is there any way you could update the readme with the specific versions of the dependencies used? I have had problems trying to get this to compile with vs2013. Troubles with V8 more then anything.