2.0.0

We're rebranding http-remoting-api to be a part of the 'Conjure' ecosystem.

• maven group changed: com.palantir.remoting-api -> com.palantir.conjure.java.api
• packages changed:

+com.palantir.conjure.java.api.errors
-com.palantir.remoting.api.errors

• deleted deprecated code
• moved tracing classes to https://github.com/palantir/tracing-java
• new com.palantir.conjure.java.api.config.service.UserAgent class from http-remoting