Merge pull request #1 from adamobeng/master

Fix minor PEP8 violations
local mapreduce and wordcount example for lecture 3
sample input, output, and python template for first homework
readme for hw1 q2
Group by first column of data, not first character

Previously, the code would only have worked if the group ids were a
single digit (i.e. <10)

Signed-off-by: Adam Obeng <github@binaryeagle.com>