Update get_involved.html

update bootstrap link to http://getbootstrap.com/
New version of neuroConstruct/CElegansNeuroML bundle
Move "about" link to the top bar #20

Added About link to top bar on every page.
Mike Vella is taking a sabbatical from the core team
Merge pull request #25 from mchelen/patch-4

Update get_involved.html
Update people.html
Tim Busbice is taking a sabbatical from the core team

Moving name into contributor list from core team as is common practice
Merge pull request #27 from rayner/master

New version of neuroConstruct/CElegansNeuroML bundle
Merge pull request #28 from erikmontes/master

Move "about" link to the top bar #20
Vahid Ghayoomi is a contributor

For work on PyOpenWorm
Added science focused page
Update science background
Baby blue
Merge pull request #29 from openworm/master

Bring latest from master into branch