Update service.js

bind is now async so need to call addMembership after we are bound
Merge pull request #2 from jedmccaleb/patch-1

Update service.js
only test on node 0.10 due to bind api change
update mocha devDep
fix addMembership call for node 0.10

Bind is async
update badges on readme

[ci skip]
0.1.0
make `new` keyword optional internally
wrap service in emitter for 'up' event

Allows the user to easier detect when a service is offline by waiting
for the 'down' even on an instance versus using the browser. The browser
may return multiple services with the same name.
death count is per instance
1.0.0
Merge pull request #1 from defunctzombie/master

Merge from upstream