Add API login where user can send email and password to api/v1/sign_in and receive authentication key
Revert "Add API login where user can send email and password to api/v1/sign_in and receive authentication key"

This reverts commit 6b29b241cbcfdb071d340ea6a83d2e9401114c32.
Revert "Revert "Add API login where user can send email and password to api/v1/sign_in and receive authentication key""

This reverts commit a451cfd3d6b48e3ecc9b7a44f4fc421d1c202417.
Revert "Revert "Revert "Add API login where user can send email and password to api/v1/sign_in and receive authentication key"""

This reverts commit 927ce9912a708309e2bedcc9893403c92eb68532.
Revert "Revert "Revert "Revert "Add API login where user can send email and password to api/v1/sign_in and receive authentication key""""

This reverts commit fd99ba568c773023e83a3b2696bdb1a0513b660f.