exec binaries in start.sh

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #38 from flynn/start-exec

exec binaries in start.sh
Flush logs to HTTP connection after each write

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #39 from flynn/flush-logs

Flush logs to HTTP connection after each write
Update host.Job usage

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>