Fixed #19090 - Added PostgreSQL connection note.

Thanks Melevir for the patch.
Fixed #5805 -- it is now possible to specify multi-column indexes. Thanks to jgelens for the original patch.
Fixed formatting of get_FOO_display example
Merge pull request #493 from edavis/fix-get-foo-display-docs

Fixed formatting of get_FOO_display example
Added a note and link to CLA from contributing docs
model_split: Fixed #19236 - fixed error for abstract models with a split method
Remove some bizzare and unnecesary code.
use six.string_types for python3
Merge pull request #494 from mrj0/model_split

model_split: Fixed #19236 - fixed error for abstract models with a split method
Added multi-column indexes to the 1.5 release notes.
Corrected a typo that inadvertently made its way into the docs.
Fixed #19240 -- include pagination error details in ListView 404

Thanks to seawolf for the patch
Fixed #18949 -- Improve performance of model_to_dict with many-to-many

When calling model_to_dict, improve performance of the generated SQL by
using values_list to determine primary keys of many to many objects. Add
a specific test for this function, test_model_to_dict_many_to_many

Thanks to brian for the original report and suggested fix.
Merge pull request #495 from aisipos/ticket_18949

Fixed #18949 -- Improve performance of model_to_dict with many-to-many
Demonstrate how to round to integers using floatformat templatetag
Fixed #19241 -- Improved floatformat docs

Demonstrate how to round to integers using floatformat templatetag
Merge pull request #496 from pydanny/ticket_19241

Demonstrate how to round to integers using floatformat templatetag
Fixed #18949 -- Fix broken test interactions in ModelForms tests

A test in Model Forms test was specifically referring to a fixed
primary key, which was now being used up in a newly committed.
This has been worked around by specifying a higher primary
key.
Removed redundant docs addition across two commits

d5c3c45f2fdfee09d81ad8dc7b0db8338d6d0aae

a70492e6b532905c921678f35b5c60b22387f1c6
Fixed py3 compatibility for 5a00a57aa591c766f5ee1d8c59b64618d74fe191