Adding support for internal ip/port usage.

This patch adds support for using -internal to register docker0
internal ip and port settings, instead of using the docker host
mapped ones.
Updated the README.md to reflect changes
added the binary
and now the linux_amd64 binary, not the darwin one
- Use etcd Set instead of Create to get around HTTP 412 Precondition Failed loop
Merge pull request #26 from deas/master

Use etcd Set instead of Create to get around HTTP 412 Precondition Fai...
Add SERVICE_IGNORE to documentation
Add skydns2 backend
Rebuild stage/registrator
Merge pull request #29 from sheldonh/skydns2

Add skydns2 backend
pulled out consul for now
and rebuild binary
added some code style suggestions
Don't export private methods
Rebuild
Merge pull request #30 from sheldonh/skydns2_private_methods

Skydns2 private methods
merged upstream
Add TTL refresh (for etcd and skydns2)
Document TTL expiry
Rebuild