Update pypi_spec.rb

Change line 68 to designate the correct server.  It appears there may have been a recent change to PYPI system settings. Deploying to the old url will succeed, but the package will never be updated on the main PyPi repo.

More information regarding this problem: https://bitbucket.org/pypa/pypi/issue/123/sdist-upload-returns-success-but-no-new
Update pypi.rb

Change `DEFAULT_SERVER` -> http://pypi.python.org/pypi
The previous value causes deployment to target a server that IS NOT the main PyPi repo and will not update the package for pip installations.
Merge pull request #116 from eikonomega/master

Update PyPi default server.