update tox to test pypy, py26, py27, py33, django1.5 and django1.6

django 1.6 doesn't actually work yet, but there are other efforts to get that working
pass `using` to index_queryset for update
Update solr schema template to fix stopwords_en.txt relocation

Seems that in versions >3.6 and >4 stopwords_en.txt moved
to a new location. This won't be backwards compatible for
older versions of solr.

Addresses issues #558, #560
In addition, issue #671 references this problem
updated tox to test django 1.5 only
switch testing configs to solr 4

all solr tests past but 2, content extraction and more_like_this
update solr schema for solr 4
Revert "switch testing configs to solr 4"

This reverts commit 73f6c430736222aed999e473413953e950f5180e.
rename solr schema for tests
update solr test configuration for solr 4
removed '_version_' from results before comparisons in tests
solr tests require more like this handler

2 tests to go, spelling handler, and content extraction
fix solr 4 testing spelling config for