Merge pull request #13 from osroca/master

Fixes bug in local predictions reported by a BigML user

There are a couple of broken tests testing with spam.csv due to the new Source server config that makes that the field "Text" is taken as categorical instead of text. I'll fix them asap.
Merge pull request #14 from osroca/master

Fixes broken tests due to changes in BigML algorithms output

As I said in one comment, there is still a test on predictions (with Spam model) that needs to be revisited once BigML says if they have a bug or not.
Code formatting
After talking with @jao the test has to be fixed as I did

We set `language='en'` in field "Message" `term_analysis`.