Test cases updated and related changes done to code.

* tests/test_codeeval.py: tests for plugins/codeeval.hy
* tests/test_github.py: tests related github plugins updated
* plugins/codeeval.hy: dry_run feature added for testing purpose
* plugins/github.hy: dry_run was not appending "Core Team consists of: "
  string

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
ignore nose generated hidden file .noseids