shorten source file paths in callstacks sent to rollbar.com
calculate and send fingerprint which intelligently groups errors by their unique callstack (otherwise the same errors that have a variable text in their error message show up as unique)
Add NEWS file.
Add severity level constants for convenience.
Replace initChannel() with init().
Don't try to close nil response bodies.
Clean up stderr error reporting.
Report error when buffer is full.
Increase default buffer size to 1,000 errors.
Merge branch 'master' of https://github.com/triggit/rollbar into triggit-master

* 'master' of https://github.com/triggit/rollbar:
  calculate and send fingerprint which intelligently groups errors by their unique callstack (otherwise the same errors that have a variable text in their error message show up as unique)
  shorten source file paths in callstacks sent to rollbar.com
Refactor: add Stack and Frame, plus better tests.
Merge branch 'triggit-master'

* triggit-master:
  Refactor: add Stack and Frame, plus better tests.
  calculate and send fingerprint which intelligently groups errors by their unique callstack (otherwise the same errors that have a variable text in their error message show up as unique)
  shorten source file paths in callstacks sent to rollbar.com
Fix line numbers in the payload.
Clean up response body closing.
Update README.
Bump version to 0.1.0
Merge remote-tracking branch 'upstream/master' v0.1.0