Merge pull request #92 from pin/shutdown-hook-race-fix

Make Shutdown blocking to ensure outstanding requests completion

Merge pull request #81 from pin/bump-version-to-v3

Bump major version to v3 and add module compatibility

Merge pull request #80 from pin/fd-leak-fix-fix

Fix sender FD leak fix

Merge pull request #66 from m-tmatma/feature/fix-client-example

add missing tftp in an example.

Merge pull request #29 from pin/minor-readme-fix-2

minor formatting fix

Merge pull request #11 from pin/osx-test

osx test

Merge pull request #6 from pin/misc-stuff

Misc stuff from George