Several fixes to authenticator, added more unit tests

Some fixes include, in more detail:
- Using little over big endianess in some parts
- Flagging all the constructor numbers as unsigned
- Fixed bugs with factorizer
- Implemented TLSharp's RSA

README.md

@@ -7,10 +7,9 @@ The files without the previously mentioned notice are no longer part of TLSharp
 to make them entirely different.
 
 ### Requirements
-This project requires the following Python modules, which can be installed by issuing `sudo -H pip install <module>` on a
+This project requires the following Python modules, which can be installed by issuing `sudo -H pip3 install <module>` on a
 Linux terminal:
 - `pyaes` ([GitHub](https://github.com/ricmoo/pyaes), [package index](https://pypi.python.org/pypi/pyaes))
-- `rsa` ([GitHub](https://github.com/sybrenstuvel/python-rsa), [package index](https://pypi.python.org/pypi/rsa))
 
 ### We need your help!
 As of now, the project is fully **untested** and with many pending things to do. If you know both Python and C#, please don't