binomial regression example (#190)

* commit binomial regression example notebook

* lot of small updates

- removed mention of glm module
- fixed the pluralisation of data
- removed repeated "recap"
- changed eta -> p which makes more sense in this example
- added double y axes on data space plots
- added some pointers to further information + link to relevant wikipedia page
- set numpy global random seed - required for scipy distributions generating the dataset

* switch to numpy.random.binomial for dataset generation

* np.random.binomial -> rng.binomial

Author: drbenvincent

examples/generalized_linear_models/GLM-binomial-regression.ipynb

@@ -15,6 +15,7 @@ Gallery.contents = {
     "generalized_linear_models/GLM": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-linear": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-logistic": "(Generalized) Linear and Hierarchical Linear Models",
+    "generalized_linear_models/GLM-binomial-regression": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-hierarchical-binominal-model": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-hierarchical": "(Generalized) Linear and Hierarchical Linear Models",
     "case_studies/hierarchical_partial_pooling": "(Generalized) Linear and Hierarchical Linear Models",