Adding a user to an msco project should work on both username and email id

[Joern Ungermann]

No description provided.

[Tanish Grover]

Can I work on this issue?

[Shivashis Padhi]

Assigning issue to Tanish

[Tanish Grover]

Is there a need to handle a case in which someone uses username same as someone else’s email?

[Shivashis Padhi]

let’s not let users use @ in usernames, that will fix it right?

[Tanish Grover]

Okay, I’ll add that validation.

[Reimar Bauer]

add user using username or email in mscolab, fixes #484

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