fixes #148: close body to prevent too many files
agent now sends docker host IP during registration
Hint on port for shipyard url registration.

Based on quickstart[ https://github.com/shipyard/shipyard/wiki/QuickStart ], shipyard would be running at 8000. Without port agent fails. This will help first time users. Assuming error checking will be beefed up at some point.
Merge pull request #7 from chad-lancour/readme

Hint on port for shipyard url registration.
go fmt
Merge branch 'master' of github.com:shipyard/shipyard-agent
combined register into run (no longer a separate step) ; added Dockerfile
updated readme for new run method
updated readme
revert to http
revert to use http for daemon communication for now
combined register into run (no longer a separate step)
updated to support docker 0.8 ; fixes #14: can specify listen address
merged master