[python-pytrakt] Feature: Return responses of Scrobble methods

[glensc]

This allows applications to do something with the responses.

Docs:

• https://trakt.docs.apiary.io/#reference/scrobble/start
• https://trakt.docs.apiary.io/#reference/scrobble/pause
• https://trakt.docs.apiary.io/#reference/scrobble/stop

Needed by:

• https://github.com/Taxel/PlexTraktSync/pull/761

[glensc]

Copying the method body in downstream projects to get things moving:

• Taxel/PlexTraktSync@631d3a6 (#761)

[glensc]

Copied to my fork:

• https://github.com/glensc/python-pytrakt/commit/a24cc576821f98c36409160f0c9d8dfcb4833042