add tmp wire file to .gitignore
Setup TravisCI to report cov stats to coveralls.io.

Also add a coveralls.io test coverage badge to the README.
Instruct TravisCI to install coverage report tool.
Remove test coverage report refs from README.md.

This is no longer needed since the repository is now configured to work
with coveralls.io for test coverage reporting.

Closes #17
Add godoc reference badge to README.md.
added method AddUserAgent to support properly formatted user agent
use DefaultUserAgent; remove userAgent param
formatting; nitpicks