navbar, front page updates

Fix social icons placement, grid display for events listings on home
page, improve account registration form
new, better set of social icons
Bootstrap libraries, node action links

Include Boostrap files from libraries folder instead of theme folder
Change node edit options to use dropdown button menu instead of tabs
improve book navigation

switched from Bootstrap pager to button group
limit button text length to 35 characters
Wrap book $tree in a Boostrap well class
page tab/action change

Change page #primary menu from tabs into Bootstrap button dropdown
group. Add icons to each option.
Fix G+ icon
Backups of prior social icon set