Adding SendWithUs VidGrid

Adding SendWithUs VidGrid
Updated Python Web Hook Code Example

Fixed syntax, added imports to simplejson and flask. and more, ayo
removed the space, fixed the glitch
Merge pull request #558 from mbernier/patch-2

removed the space, fixed the glitch
Merge pull request #557 from 0xdeafcafe/develop

Updated Python Web Hook Code Example
Remove feedback and edit from print stylesheet

Closes #405
Merge pull request #559 from mbernier/patch-3

Remove feedback and edit from print stylesheet
transacation -> transaction
Merge pull request #560 from mbernier/patch-4

transacation -> transaction
Show ip_pools page
Rolling back these changes for IP pools

@johnvajda - please double check that this is all still valid.

I just rolled back these changes: https://github.com/sendgrid/docs/commit/6bc031aa8dab92bb832d2bd727b1deccb0c6ecb6
Merge pull request #561 from mbernier/patch-5

Rolling back these changes for IP pools
Merge pull request #562 from sendgrid/develop

Deploy 🗽