Upgraded to Django 2.2.1 & DRF 3.9 plus some other package upgrades with minor changes.

[kooshan75]

Fixes #115 & #111.
Upgraded almost every package to its latest release and migrated to Django 2.2.1 & DRF 3.9.
Changed two incompatible packages that the project was using them:

django-disposable-email-checker

Which did not support Django 2.2.1, I switched it to email_validator, which almost has the same functionality.

django-rest-knox==3.0.3

Which was incompatible, I switched it to a more reliable and known package called django-rest-auth and moved to its Token Authentication method.

[kooshan75]

I'm also planning to complete the implementation of test files and committing them in the next couple of days since I've run tests manually.

[kooshan75]

I'm also planning to complete the implementation of test files and committing them in the next couple of days since I've run tests manually.

Done.
All tests were successful & ./scripts/test_local_backend.sh returns that all tests have passed.
@abossard
@lfrodrigues
@pconerly
@andrealmar
@DFilipeS

I'd be honored if you guys could review my code.

[gwsampso]

Other than the travis build failing because of #120 looks like i would be best to use this if starting a fresh project @kooshan75 ?

[kooshan75]

Other than the travis build failing because of #120 looks like i would be best to use this if starting a fresh project @kooshan75 ?

Yes of course. The old version of this project doesn't support lots of services.