adding airs schema browser link and pages
Revert "adding airs schema browser link and pages"

This reverts commit f56f6db63c1b2d9989bf279582bd087e3ed942c1.
adding airs items
Update airs.md
Update side-nav.html
Update side-nav.html
Update airs.md
Update airs.md
adding layout
Update _config.yml
Revert "Update _config.yml"

This reverts commit 033410581e5b5379a9f8c31b6dfb7ee977da55bb.
Update airs.md
adding niem functional overview graphic
Create niem.md
Update airs.md
adding niem content to side nav
Adding graphic and some outline text
fleshing out more NIEM content
Merge pull request #5 from eric-jahn/gh-pages

AIRS and NIEM pages added