Héctor

Travis builds in OSX for Python 2.6 are failing. ~~~~ img2 = scipy.misc.imresize(img, 0.5, interp='bicubic', mode='F') AttributeError: 'module' object has no attribute 'imresize' ~~~~

Add 2.7 and 2.8 from the most recent version of the book

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## Exercises missing Two new exercises (2.7 and 2.8) appear in the latest version of the book available online and they don't in the repository. Check [the book online](http://incompleteideas.net/book/the-book-2nd.html) for...

## Expected Behavior Running GradientBandit shouldn't raise any overflow warnings. ## Current Behavior The warning "RuntimeWarning: overflow encountered in double_scalars" is raised occasionally in the following lines: estimators.py:110 `updated_numerical_preference[action_selected] =...