Revert "fix imports for https://github.com/svaiter/SublimeJEDI/issues/30"

This reverts commit ff8ab9cbe54d9faaadd355e2da6ff84ada7a34c2.
* make goto definition and find usages to preview jump target when multiple options are present
* refocuses the initial view in no option was selected on goto definition
* removes docstrings