Fixed autocomplete() method: spaces in query
added test for autocomplete whitespace fix
removed python 1.4 / python 3.2 tox env because thats not possible

also pinned versions of requirements for testing
Fixed #575 & #838, where a change in Whoosh 2.5>
required explicitly setting the Searcher.search() limit
to None to restore correct results.

Thanks to scenable and Shige Abe (typeshige) for
the initial reports, and to scenable for finding
the root issue in Whoosh.
Merge branch 'master' into skyhood-master