fix nrepl-jump on remote nrepl connection

minor changes made to conform with travis tests

Depending on tramp. Using tramp functions to determine tramp prefix. home-prefix-adjustment will consider windows. nrepl-emacs-or-colojure-side-adjustment pushed up the call chain. Tested on Windows, MacOS, Linux.

Travis is being picky :-)
Merge pull request #311 from klang/feature/remote-nrepl-and-nrepl-jump

Feature/remote nrepl and nrepl jump