Organization invitation is case sensitive

[bsekachev]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

If a user has email in the database "User@host.com", I can invite the user to an organization using user@host.com.

Current Behaviour

I get error:
Could not invite this member "user@host.com" to the organization. It is not a valid email in the system.
If use "User@host.com", invitation works

Possible Solution

Make invitation case insensitive.