Feature/orgz

[jeremyletang]

This is a work in progress, please do not merge.

• [x] create an organization
• [ ] proper handling of mysql db (may need to specify user/passw)
• [ ] dublicate definition of a user (in elastics / mysql)
• [x] create delete join links
• [x] join organization
• [x] get join link from an organization
• [x] get organization
• [x] leave organization
• [x] list organization membership
• [x] expel from organization

[jeremyletang]

@anas10 @crufter this is ready to review guys.

[jeremyletang]

is it ok to merge ? I will need this for the next steps.

[crufter]

Epic PR! Merged