Adding egg-info to .gitignore
Basic support for different tiles from google.
Added test for jpeg decoder.

Some google tiles are served as JPEGs. Thus a jpeg decoder is required.
This adds a test for it and raises an exception. Otherwise it just
breaks at a later point.
Adding test for google map styles.
Uppercase styles now allows.

Just lowercasing the style before using it.
Merge pull request #391 from krischer/master

Support for the other styles from Google Maps