Lots of book formatting changes.

Changed default sizes of plots, changed the book template for
pdf creation, and lots of minor edits, most changing bold to
italic, and removing italic for emphasis.

pdf/merge_book.py

@@ -1,6 +1,6 @@
 from __future__ import print_function
 import io
-import IPython.nbformat as nbformat
+import nbformat
 import sys
 from formatting import *
 
@@ -28,10 +28,8 @@ def merge_notebooks(outfile, filenames):
 
 if __name__ == '__main__':
     f = open('book.ipynb', 'w', encoding='utf-8')
-    '''merge_notebooks(
-        ['../00_Preface.ipynb',
-         '../01_g-h_filter.ipynb',
-         '../Appendix_A_Installation.ipynb'])'''
+    '''merge_notebooks(f,
+        ['../02-Discrete-Bayes.ipynb'])'''
 
     merge_notebooks(f,
         ['../00-Preface.ipynb',