Fix parent process watcher thread (palantir#416)

* Fix parent process watcher thread

* timer

Increase max workers to 64 (palantir#415)

Make python language server exit when parent process dies (palantir#410)

Add license to source distribution (palantir#396)

skip invalid definition to fix palantir#362 (palantir#364)

Upgrade Jedi to 0.12.0 (palantir#340)

Default syntax error offset to zero pyflakes (palantir#332)

* Default to zero

* Default to zero

Remove parameters from async handler (palantir#320)

Prefer autopep8 (palantir#315)

handle cancel correctly (palantir#289)

* handle cancel correctly

* move paren