Merge pull request #1 from joakim-hove/master

Fine to add this, it seems to me like a good programming practice.
Added static method Connection.runCommand()
Removed commented out code
Added .gitignore which is now setting backup files to be ignored
Merge pull request #2 from agchitu/master

My first pull request.
Nothing to review here, this was purely for learning, though there is some added value in it.
Replaced the Connection class with ErtClient