First pass through NsOneProvider

They were working around the lack of class hierarchy, this addresses that by
adding 2 child classes. It gets rid of a bunch of ugly default params and
if-this junk in the main class that was trying to deal with plain & geo records.
Also as a positive side effect it gets rid of some hacks that lived in
Route53Provider dealing with the fact that the old setup couldn't detect going
to/from a GeoDNS record correctly.

Add __main__ calls to main in cmds

Fixing octodns/record.py link

use a percentage of change/deleted records rather than an absolute count

Dyn monitor user agent

Route53 geo conv fixes

Handle Cloudflare not escaping semicolons

readme: Fix link to contributing doc

Fixed broken link to Records Documentation

readme: typos and bad links

Fixes typos in the Supported providers table

Fixes to get a working sdist build

Supported providers readme

DynProvider Traffic Directors want lowercase province without country

Add the octoDNS logo

yamllint is not a hard requirement, just something we use in our workflow

DynectSession creation isn't thread-safe so we need to lock around it

It's actually session creation that isn't thread-safe so we need to lock around
that.

Multi threaded planning