Fix issue 1377, install correct version of py-parsedatetime

[sksksksksksksk]

Quick fix for a dependency issue.
There is probably a bit cleaner solution, but this works for the moment.

[diabeticpilot]

I'm on an Edison and on the dev branch. I just ran this script and got the following error. Is there a syntax error there with three = signs?

`Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 269, in run
InstallRequirement.from_line(name, None))
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 173, in from_line
return cls(req, comes_from, url=url, prereleases=prereleases)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 71, in init
req = pkg_resources.Requirement.parse(req)
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2793, in parse
reqs = list(parse_requirements(s))
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2721, in parse_requirements
"version spec")
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2686, in scan_list
raise ValueError(msg, line, "at", line[p:])
ValueError: ('Expected version spec in', 'parsedatetime===2.5', 'at', '===2.5')

Storing debug log for failure in /root/.pip/pip.log`