A solution for Lesson 4 Problem Set - Improving the Index
Merge pull request #1 from tracymu/master

Answer for Lesson 4, Problem Set, Improving the Index
Create hint and solution files with directions for every exercise section.
Solution for 1.09
soloutions and hints for programming_1
Solution for 1.4- Speed of light
fixed spaces that Lucy mentioned
Solutions for 1.4 Speed of light
Merge pull request #3 from catherine-jones/master

soloutions and hints for 1.02
Merge pull request #5 from nadiavu/master

Solution for 1.4- Speed of light
Merge remote-tracking branch 'upstream/master'
Solution to Lesson 3 Problem Set Optional - Word Count