Renames contributing.md to fix #2.
Changes contribute link.
Adds contribution guidelines.

Contribution guidelines still need to be added.
Update statements.md
note about xAPI 401 unauthorized
Merge pull request #3 from ryansmith94/patch-1

Fixes #2.
Merge pull request #6 from jpcid/master

note about xAPI 401 unauthorized
Merge branch 'master' into pr/4

Conflicts:
	contribute.md
	statements.md
Merge branch 'pr/4' into jekyll