Pyaescrypt

* Fixed bug when handling same input and output file

* Preventing users from specifying the same input and output file
* Other minor updates

* Support for binary stream encryption/decryption

* Fixed Python version compatibility classifier
* Removed useless stat

Switched from [pycrypto](https://github.com/dlitz/pycrypto) to [PyCA Cryptography](https://github.com/pyca/cryptography) for crypto primitives.

Added an option to pass password as command-line argument to the script.