Merge pull request #469 from jeremygray/master

remove opensslwrap; tweak some docs
ENH: tweak keyboard component deault duration

- typically want keypress to end routine, not last for 1s, so set default duration = empty
BF: KeyComp: 'escape' works with empty Allowed Keys; closes #467

- fix case in which empty -> any key -> slurp up 'escape' -> not detected

Notes:
- arbitrary events could escape/quit very easily, just set endExpNow = True