Google Analytics Segments are now strings
Since the advanced segment changes Google has rolled out, Google Analytics segments are now alphanumeric instead of integers.  https://developers.google.com/analytics/devguides/config/mgmt/v3/mgmtReference/management/segments

When I run:

```
from pandas.io.ga import GAnalytics
gAnalytics = GAnalytics()
gAnalytics.create_query(‘web_id’, ‘pageviews’, ’2013-08-12′,’2013-08-14′, ‘date’,             segment='A1B234').execute().get(‘containsSampledData’)
```

I get the following error:
returned "Invalid value 'ga:A1B234' for segment parameter.">, invalidating data!

I believe that if the segment is not dynamic, Pandas is expecting an integer only.
