Added 1.5.5 and 1.4.9 release notes
Fixed #21307 -- Moved TransRealMixin to django.test.utils.
Fixed E225 pep8 warnings.
Workaround admin scripts test failures on Windows+Python 3.

Change strategy used to examine instrumented output to acommodate the
fact that on Windows, where the path separator is '\', repr() of Python
modules has changed in Python 3 to use escaped backslashes in the FS
path section (e.g.
'C:\\python3x\\Lib\\site-packages\\django\\contrib\\auth\\models.py')
without having to special-case based on platform.
Fixed #13245: Explained Oracle's behavior w.r.t db_table
and how to prevent table-name truncation

Thanks russellm & timo for discussion, and timo for review.
Fixed #21298 -- Fixed E301 pep8 warnings
typo on 1.7 release notes
Merge pull request #1801 from collinanderson/patch-10

typo in 1.7 release notes
Fixed #12027 -- Fixed EmailValidator to reject a trailing dot.

Thanks Klas H for the report and claudep for the patch.
Fix migration planner to fully understand squashed migrations. And test.
Fixed #19941 -- Removed sys.path hack when running the test suite.

Thanks jezdez for the suggestion.
Bumped release date for 1.5.5 & 1.4.9.
Fixed #20945 -- Allowed cache tag to use a specific cache.
Added missing newline in docstring; refs #20945.