This also completes the milestone: "Template class should not depend on the
View class."

The template module no longer imports from the view module.

This merge adds 21 unit tests.

Also added a test case.

Note that the removed logic around issue #34 remains elsewhere in
the code in the Template._render_tag() method.

Also added a test case.

The commit also adds a unit test for this case.

From: https://github.com/alex/pystache/commit/b2ae206d68961b8aef568ceaa3dd1274150ef23e
Into: issue_34

Fixed a bug which caused the unit tests related to rendering zeroes to fail
when using PyPy.  Using "is" to compare integers relies on an implementation
of CPython.  The operator "==" should be used instead.

Switched to using optparse from argparse, which is only available
starting in Python 2.7.