Merge pull request census-instrumentation#75 from dinooliva/rpc-const…

…ants

Updates RpcConstants to have appropriate ViewDescriptors.

Merge pull request census-instrumentation#16 from sebright/remove-tag…

…-class

Removes 'Tag' and moves its utility methods to a 'StringSanitization' class.

Merge pull request #1 from sebright/enable-travis

Adds .travis.yml.