Mocks for Adapter class

[cuducos]

This PR fixes some broken tests by mocking the method from rosie.chamber_of_deputies.adapter.Adapter that downloads stuff from the original source.

For those who are new to unittest.mock:

• A live coding I made about unittest.mock (in pt-BR)
• PropertyMock (first time I used it)

[coveralls]

Coverage increased (+8.3%) to 96.381% when pulling e3ae701 on cuducos-creating-core-module into 5ca30d9 on anaschwendler-creating-core-module.

[anaschwendler]

Checked @cuducos changes to my pull request and aimed to understand what he did.
Seems fine, looks good, I can work with that.

Thanks a lot @cuducos and @jtemporal ! <3

[cuducos]

Checked @cuducos changes to my pull request and aimed to understand what he did.

If you need help drop a line and I can do a walkthrough ; )

[coveralls]

Coverage increased (+8.3%) to 96.381% when pulling 4fd28b3 on cuducos-creating-core-module into 5ca30d9 on anaschwendler-creating-core-module.

[anaschwendler]

Following this code, it may be necessary to delete temporary classifiers that might be running in your enviroment.
If you used to run rosie before that, by now you need to delete all .pklfiles in /tmp/serenata-dataand run again.
If you don't do that, the error that it introduce is:

Thanks @jtemporal for helping me finding this.