#164489780 Verify user signed up with email

[jnkindi]

What does this PR do?

• Sends verification email and verifies account

Description of Task to be completed?

• On signup, an email is sent to the user with a URL, when the user clicks it. He/She is directly verified.

How should this be manually tested?

• On signup, you can check for an email.

Any background context you want to provide?

• None

What are the relevant pivotal tracker stories?

• 164489780

Screenshots (if appropriate)

Questions:

• None

[cyrielo]

This PR is too large, consider splitting the works

[cyrielo]

You would also need to rebase to have the latest changes

[jnkindi]

@cyrielo, I had checkout from an unmerged develop but am fixing it.