Merge pull request #7 from mvk123/master

updated emacs command and fixed typo
Pushed back uncovered material, moved forward covered material
Added first practice problem
Merge branch 'master' of github.com:jrbalsano/cs3157-recitations

Conflicts:
	recitation-3.md
Quick corrections
Change Recitation 3 to git only

Removed C language overview and How to NOT Get a Zero
Moved old Recitation 3 material to Recitation 4
Remove git content from recitation 4
Merge pull request #8 from chmullig/master

Remove git content from recitation 4
Added :x shortcut to vim shortcuts.
Merge pull request #9 from serenasimkus/master

Added :x shortcut to vim shortcuts.