Timeout the slow tests in Travis to less than 10 minutes
Another test for the Karr summation convention
Added a fallback to deprecated IPython.frontend module for IPython
versions less than 1.0.
Deprecated IPython extension. Use init_printing() instead.
Raise error in case index transformation is not linear
Added an issue number, required for all formal deprecations.
Merge branch 'master' into tutorial

Conflicts:
	doc/src/tutorial/tutorial.en.rst
	sympy/printing/latex.py
Merge branch 'pr2081_review_4' of https://github.com/raoulb/sympy into raoulb-pr2081_review_4
Add a warning filter to make sure the deprecation warning is shown for
the IPython extension.
Add links to the SciPy tutorial page
Fix tutorial for printing change
Add lambdify section to new tutorial
Seconds, not minutes
Remove singleton example, since footnotes can't have examples in LaTeX
Fix rollingdisc image

This makes the pdf docs build again.
Use a higher resolution logo for the pdf docs
Merge pull request #2065 from lidavidm/issue_3796

Issue 3796
Merge pull request #2223 from tswast/typos

Typos
Merge pull request #2081 from thilinarmtb/3128_Sum_Product_Simplification

3128: Sum / Product Simplification.
Merge pull request #2204 from raoulb/document_karr_convention

Document Karr convention