change default cell style to ipython and s/book/report

IPython/nbconvert/templates/latex/latex_article.tplx

@@ -1,7 +1,7 b''
 
 % Default to the notebook output style
 ((* if not cell_style is defined *))
-    ((* set cell_style = 'notebook_style.tplx' *))
+    ((* set cell_style = 'ipython_style.tplx' *))
 ((* endif *))
 
 % Inherit from the specified cell style.

IPython/nbconvert/templates/latex/latex_report.tplx

@@ -1,7 +1,7 b''
 
 % Default to the notebook output style
 ((* if not cell_style is defined *))
-    ((* set cell_style = 'notebook_style.tplx' *))
+    ((* set cell_style = 'ipython_style.tplx' *))
 ((* endif *))
 
 % Inherit from the specified cell style.
@@ -18,7 +18,7 b''
 ((* endblock predoc *))
 
 ((* block docclass *))
-\documentclass{book}
+\documentclass{report}
 ((* endblock docclass *))
 
 ((* block h1 -*))\part((* endblock h1 -*))

IPython/nbconvert/templates/latex/latex_sphinx_article.tplx

@@ -1,9 +1,3 b''
-
-% Default to the python output style
-((* if not cell_style is defined *))
-    ((* set cell_style = 'python_style.tplx' *))
-((* endif *))
-
 ((* extends 'latex_article.tplx' *))
 
 %===============================================================================

IPython/nbconvert/templates/latex/latex_sphinx_report.tplx

@@ -1,9 +1,3 b''
-
-% Default to the python output style
-((* if not cell_style is defined *))
-    ((* set cell_style = 'python_style.tplx' *))
-((* endif *))
-
 ((* extends 'latex_book.tplx' *))
 
 %===============================================================================