Fix loop condition in python sort driver.
Add a lua version of the sort code.
add playlist link to readme, and make links pretty
fix printf format specifiers (hopefully)
reorganize notes
added lec02 notes; fixed types on lec01
fix undefined behavior

<< is only defined if the number of bits to shift is smaller than the
size of the type being shifted. Thanks to Charles Ahmed for pointing out
the bug.
add python implemtnations and better CPP version
add sortbench
code from today's class
missing include, and c++03 compatibility
notes for lectures 3 and 4
benchmark data from Alex's macbook
C# version contributed by Vincent Jacquet
added pointer to original repo
C# version of smalltalk.cpp from Vincent JACQUET
D implementation for bigrams from Benjamin Thaut