Tag MolecularDynamics 0.1.1

This is just a simple version update.

I want to note that I did Pkg.tag("MolecularDynamics",v"0.1.1") which succeeded. Pkg.publish() did not succeed so I manually forked the repository and did this pull request. This was the error for Pkg.publish():
ERROR: key not found: "token"
 in getindex at dict.jl:615
 in token at pkg/github.jl:53
 in req at pkg/github.jl:61
 in POST at pkg/github.jl:74
 in fork at pkg/github.jl:87
 in pull_request at pkg/entry.jl:290
 in publish at pkg/entry.jl:357
 in anonymous at pkg/dir.jl:28
 in cd at file.jl:20
 in cd at pkg/dir.jl:28
 in publish at pkg.jl:57