Implemented the python-blowfish package into the encryptors api.

[NinoDoko]

As per #14, I used the python blowfish module to add encrypt and decrypt endpoints which implement blowfish in order to encrypt data. I hope I followed the guidelines properly; this can be tested by going to, for instance:

http://127.0.0.1:5000/api/blowfish/encrypt/someimportantdata
http://127.0.0.1:5000/api/blowfish/decrypt/15597aaa9b538075e80d6443f01359a15e

Blowfish allows a lot of modes to be used. These can be specified by sending the mode query argument :

http://127.0.0.1:5000/api/blowfish/encrypt/someimportantdata?mode=ofb

Also features encryptor and api tests, which should work properly with pytest.

What is missing:

• Some of the modes are not implemented. This is because some of the modes require data of length that is multiple of block_size, and I just didn't get around to implementing that.
• Entering bogus hex data in /decrypt sometimes breaks the app. I'll get around to fixing this soon.

[rafaeelaudibert]

Thank you, @NinoDoko! I appreciate all the effort you have creating this.

I have only one thing I would like you to change. Could you please move your Blowfish exception to the errors folder, altogether with the other custom errors? This way we have a better-organized codebase.

[rafaeelaudibert]

Hey @NinoDoko, just passing by to see if you have any updates on the little change I asked you?