Objects of datetime.datetime are immutable

  - Needs to be assigned the replacement to the same source variable.
  - Also fix the test to account for the year rule.
Merge pull request #131 from metatoaster/eve_central_reported

Fix for the eve central testing
Readme text to recommend use of requests.
Removing duplicate tests

  - We already tested those in the vanilla (urllib2) API tests.
Correcting terrible branch isolation practices

  - Roll back the tests that got introduced along with the cached
    timestamp branch.
Ensure tests for the requests library are done.
Merge branch 'master' into requests