Add Jinja2 to tests_require

[koobs]

Add Jinja2 to tests_require, as the test suite currently outputs the following when run without Jinja2 installed:

test_contrib.TestContrib.test_upload_template_handles_jinja_template
upload_template() should work OK with Jinja2 template ...
Fatal error: Traceback (most recent call last):
  File "fabric/contrib/files.py", line 129, in upload_template
    from jinja2 import Environment, FileSystemLoader
ImportError: No module named jinja2

Unable to import Jinja2 -- see above.

Aborting.
ERROR
test_contrib.TestContrib.test_upload_template_jinja_and_no_template_dir ...
Fatal error: Traceback (most recent call last):
  File "fabric/contrib/files.py", line 129, in upload_template
    from jinja2 import Environment, FileSystemLoader
ImportError: No module named jinja2

Unable to import Jinja2 -- see above.

Aborting.
ERROR

<snip>

======================================================================
ERROR: test_contrib.TestContrib.test_upload_template_handles_jinja_template
upload_template() should work OK with Jinja2 template
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/nose-1.3.3-py2.7.egg/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/tests/server.py", line 478, in inner
    return func(*args, **kwargs)
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/tests/test_contrib.py", line 69, in test_upload_template_handles_jinja_template
    use_jinja=True, template_dir=template_dir)
  File "fabric/contrib/files.py", line 139, in upload_template
    abort(tb + "\nUnable to import Jinja2 -- see above.")
  File "fabric/utils.py", line 34, in abort
    sys.exit(1)
SystemExit: 1

<snip>

======================================================================
ERROR: test_contrib.TestContrib.test_upload_template_jinja_and_no_template_dir
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/nose-1.3.3-py2.7.egg/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/tests/server.py", line 478, in inner
    return func(*args, **kwargs)
  File "/mnt/home/user/repos/freebsd/ports/devel/py-fabric/work/Fabric-1.9.0/tests/test_contrib.py", line 81, in test_upload_template_jinja_and_no_template_dir
    upload_template(fname, '/configfile.txt', {}, use_jinja=True)
  File "fabric/contrib/files.py", line 139, in upload_template
    abort(tb + "\nUnable to import Jinja2 -- see above.")
  File "fabric/utils.py", line 34, in abort
    sys.exit(1)
SystemExit: 1

<snip>

Ran 380 tests in 245.368s - FAILED (errors=2)

[bitprophet]

Thanks, I think those tests were added or manipulated recently and the contributor probably overlooked setup.py.