Added Some adjunct info to README
Removing unused dependencies

Found a couple dependenices which aren't being used. The jsr305 dependency
in helios-testing was causing a problem for one of our users because it
conflicts with a lower version they are using. Since we're not using it,
might as well remove it and not force them to exclude it in their pom.
Merge pull request #224 from spotify/drewc/comm

Added Some adjunct info to README
Merge pull request #225 from spotify/rculbertson/unused-deps

Removing unused dependencies
Use dashes not underscores in tempJob prefix

TemporaryJobs uses the tempJob prefix as the registration domain.
Depending on the registration plugin you are using, containers may
find each other by looking up SRV records in this domain. Previously
the domain contained underscores, but this caused problems for some
users because they tried to use the domain in a URI object. The URI
object does not correctly parse a string which contains underscores
because they are not allowed according to RFC 2396. The problem goes
away if we use dashes instead.
Merge pull request #227 from spotify/rculbertson/temp-jobs-invalid-uri

Use dashes not underscores in tempJob prefix
[maven-release-plugin] prepare release 0.8.23
[maven-release-plugin] prepare for next development iteration
Default to Unix socket on Linux machines

On Linux machines, default to unix:///var/run/docker.sock to talk to Docker
instead of HTTP. This will help Helios work right out of the box on Linux
boxes.