Merge pull request #12 from wiggzz/master

Added some test coverage
Removed badges for devel branch.
Update README.md
Update build from source instructions.
Update downstream-node URL
Remove stupid DS_Store
modified gitignore to ignore pyinstaller build directory.  removed pyinstaller directory
removed ds.py cli.py added downstream.py.  removed entry point from setup.py
added signing on client side
added siggy dependency
adding signature.txt as example to repo
trying to add signature.txt...
still trying...
ok added signature.txt example signature to repo.
modified travis config