[#344] Fix Issue Filtering in the Version Commands

* Modify the argsToIssueFilter function to pull and use a Version's
  projectId in order to allow category filtering for the version
  command.
* Modify the getVersionsIssues function so that it adds the versionId to
  the IssueFilter.

* Remove the project flag from the version command.

* Fix a bug causing all Issues to be shown in the version and
  nextversion commands Issue table.

Closes #344: The version Command Does Not Correctly Filter Issues