Moved lessons into a unique directory
Slides for Lessons 2 & 3
Ignored Data directory, created an excpetion for class data
Slides for Lesson 4
Merge branch 'gh-pages' of github.com:ga-students/DS_HK_1 into gh-pages

Conflicts:
	lessons/class/lesson01/nytimes.py
	lessons/class/lesson02/linearalgebrareview.md
	lessons/class/lesson02/matrix.py
	lessons/class/lesson03/aggregator.py
	lessons/kevinmp/lesson01/nyt1.csv
	lessons/kevinmp/lesson01/nytimes.py
	lessons/kevinmp/lesson02/linearalgebrareview.md
	lessons/kevinmp/lesson02/matrix.py
	lessons/kevinmp/lesson03/aggregator.py
	lessons/lesson01/nytimes.py
	lessons/lesson02/linearalgebrareview.md
	lessons/lesson02/matrix.py
	lessons/lesson03/aggregator.py
adding classwork files
Merge branch 'gh-pages' of https://github.com/kevinmp/DS_HK_1 into gh-pages

Conflicts:
	lessons/kevinmp/lesson03/aggregator.py
	lessons/kevinmp/lesson03/aggregator2.py