Remove old make commands and don't default to building the pack files as this is not needed.

The pack stage is unnecessary for a normal build, and as the addin is part of MonoDevelop now we only need to use pack for an out of bounds build, which you can still do with make pack or make release.

`-add-libraries:` and `-remove-libraries:` commands are not used as the AspNetMvc4 files are now distributed with nuget.