bump nerve and synapse version
tests: more tests around nerve exit status
tests: less fragile service restarting

we still sleep after bring the service up or down
but now, we sleep long enough to be sure that nerve is going to catch the state change
testing: add initial testing around haproxy config
nerve: cleaner handling of multiple ports for a service
[tests] support multiple helloworld services
tests: haproxy test
Merge pull request #5 from airbnb/new_smartstack

New smartstack