Fixing loop when creating issue with no parent

* This fixes an issue where hitting enter when prompted for the parent
  issue ID without specifying a number entered an endless loop. This
  was due to parseInt(answer) resulting to NaN which apparently is less
  then zero.
* The resolution I chose was to check whether the parseInt(answer) > 0
  _or_ whether the answer === false. Either one is a valid answer and
  will get the user into the correct code path.
Adding jql command to run raw JQL search

* Introducing `jira jql <query>` command which allows a user to run
  an arbitrary JQL command against the server and see the results.
Merge pull request #4 from guywithcrookedface/add_parent

Fixing loop when creating issue with no parent
Merge pull request #5 from guywithcrookedface/raw_jql

Adding jql command to run raw JQL search
Bump version 0.1.1
Update README.md with jql command
Bump version 0.1.2
Fix the version number in ./bin/jira.js and bump the version again (0.1.3)