Signatures module is working and testable.
Added gitignore.

* Copied from the main galah repo.
Added profiling code for verifying a file.

* I wanted to see if this was going to be an issue. It is not,
  verification seems to perform very well regardless of the key size.
Added note to profiling script.
Removed extraneous statements.
Added a note regarding HTTP safety.

* I'm going to not worry too much about it for now as it is clear
  after delving into the httplib source that it's not going to be safe
  if I use that library.