Updated info on warm up schedule importance

There were a lot of questions on this, and I felt this would be good info to have on the docs.
Merge pull request #563 from johnvajda/develop

Updated info on warm up schedule importance
Updated to change menu order, seo titles, and titles for the menu
Merge branch 'develop' of github.com:sendgrid/docs into develop
clarified colum name docs

removed unnecessary (and unhelpful) column name parameter from the
docs, instead documenting how to actually add a column name.

discovered through testing and clarified by @jacobmovingfwd and
@scottkawai in the Support Hipchat room
made email addition examples more readable

expanded curl call into a multiline statement for better readability
added a note about required fields

while this is documented in the parameter table, this is easy to miss
or misunderstand, this documents it a little further
Merge pull request #575 from nquinlan/lists

improved documentation around lists and adding columns & fields
Signle to Single

Left the title attr the way it was for people who have linked there, but changed the viewable title to "Single"
Update whitelabel_wizard.md
Merge pull request #578 from mbernier/patch-11

Signle to Single
Merge pull request #579 from bhammerquist/patch-1

Update whitelabel_wizard.md
Merge pull request #577 from sendgrid/develop

deploy 🌜