Removed useless extensions from file outputs

The encryption tools should encrypt a file
and not leave behind a plain text version.
This commit is a first pass at that. I'm
not crazy about the approach (os.remove)
but it achieves what I want for now.

I delteted the useless "file-encryptor"
script. Going forward I want to build a tool
that uses the two seal / unseal python scripts
with a USB dongle.