Remove nomdev.rb symbolic link

* Unison on Windows does not like to sync symbolic link files; create
a bash alias in the mean time!
Improve debugging aid for failed shell actions

* This works wonders when you are trying to figure out why a Sublime
Text Build System variant is not working!
Refactor default installation prefix parameter

* This decouples nomdev from making an unnecessary and potentially
dangerous decision — our CMake build scripts should generally be the
ones deciding things like this.
Fix couple bugs in nomdev's usage example output
Clean up a few comments
Projects Using nomdev: add nomdev.sublime-build