Merge pull request #7 from khanspers/master

new image for pihelper
chnaged image span
iframe for wordcloud
iframe for mosaic
Merge pull request #8 from khanspers/master

latest from KH
iframes
iframes
added blank target to url
updates Tools Gallery menu items
test commit.
New index page template with drop-down navbar.
Revert "test commit."

This reverts commit fce237ba6e1e47306b9d355a250a7f5107c6abdc.
Merge branch 'master' of github.com:idekerlab/nrnb.github.io
Changes made to home page, including new menu options in the dropdowns and body text.
First draft of the front page design.
Removed upcoming training events from front page. Changed "Gallery" to "Tools" on tools.html.
Minor updates only.
All headers and footers will be created by dynamic insertion.
Broken links are fixed.
Top page background image has been added.