[#issue-27] use require_relative to require test_helper
[#issue-22] remove dependency on hoe

hoe was being used to
- Martin Kleppmann's email is configured there which is
  not specified in gemspec
- run tests
- publish gems etc

have to ping Martin about which email is to be used

for running tests, added minitest autorun and pride
before and after checked that we run same number of tests
ie. 197 tests, 344 assertions
Merge pull request #29 from code-mancers/require_relative_test_helper

Require relative test helper