read_ga bug
Cannot get io.ga to work since update to 14.1 (using 0.15.0 right now):

TypeError: list indices must be integers, not Index

``` python
import pandas.io.ga as ga
df = ga.read_ga(
    property_id  = "UA-XXX",
    profile_id   = "XXX",
    metrics      = ['users'],
    dimensions   = ['dayOfWeek','hour'],
    start_date   = "2014-02-03",
    end_date     = "2014-08-03"
)
```
