also added 2 FIXMEs to intro.rst about the debugsupport for python 2.4 that needs to get removed
fix typo swtich -> switch
Fix jinjaext compatibility with Python 3
This option defaults to False for compatibility with the existing behaviour. I've added the option because I expect I won't remember to keep an extra trailing newline in my templates, and some non-HTML templates *need* that last newline. See also: https://groups.google.com/d/msg/pocoo-libs/6DylMqq1voI/GXTbZJ1Tr-sJ
Points out that the Django empty is replaced by the Flask else.