The test_login test from TestUltraProvider would fail in Python 2.7
due to the dictionary insertion order not being preserved in 2.7
and early 3.x versions. Comparing the dictionaries containing the
query parameters solves this. Snippet from test failure:

- username=user&password=rightpass&grant_type=password
+ grant_type=password&username=user&password=rightpass

Due to an import error the envvar source tests would not run
in Python 2.7

In Python 2.7 the if statement would catch both cases from the test
test_populate_lenient_fallback, so the test was failing. These are
the error strings differences between Python 2 and 3:

Python 2:
NoLenient: populate() got an unexpected keyword argument 'lenient'
NoZone: populate() got multiple values for keyword argument 'lenient'

Python 3:
NoLenient: populate() got an unexpected keyword argument 'lenient'
NoZone: populate() got multiple values for argument 'lenient'

processors - hook in to modify zones to hide stuff from octoDNS, modify things, add special records, ...

Partial support for dynamic A+AAAA records on Azure

Fix typo

Add alt text to images

for example:
`$ octodns-sync --config-file=./config/production.yaml` was throwing an error. Then, when i did `$ octodns-dump`, it prompted me to put it in this format: `$ octodns-sync --config-file CONFIG_FILE` (without the = sign)

Handle re-used pools in Azure DNS dynamic records

Allow the option to not pass Host header in healthchecks

Ensure that dynamic records map to unique Azure TM profiles

minimize Azure Traffic Manager hops for dynamic records

UltradnsProvider: Add support for ALIAS type (fix #644)