Documentation: add thread safety warning in API
Add name to authors
Merge pull request #338 from ColinDuquesnoy/master

Doc: add warning about thread safety
add company jedi by @proofit404 to emacs jedi plugins
editor list always with proper urls at the end (easier to copy)
merge authors.txt
Fix for #357/#331
Add a regression test
Add a comment
Remove test pyqt
Merge pull request #358 from ColinDuquesnoy/dev

Fix for pyqt errors with python 2.7
Executable.decorated should be protected
protect more Execution methods
pep  cleanups
move evaluate and evaluate_representation to evaluate folder
evaluator class introduction
add an execute method to the evaluator
use evaluator everywhere in representation
remove import problems - evaluate calls from a lot of places
first tests running again with the new structure