Centers mailChimp signup in SSRS of homepage

wrapping entire form in one more div, changed grid type
adds normalize-rails, thread_safe gems

in addition to adding those gems to gemfile, also adds ‘require
normalize-rails’ to application.css
Gemfile.lock updated for thread_safe 0.2.0

other minor change to home page - deleting blank line, commenting out
another.
cleans up - no content change
updates offering list #2

Centered
Drop some elements on phone for readability
makes incremental changes to formatting of home
does unimportant work to home

things aren’t centered.
Merge branch 'ad-css-work-on-home' of https://github.com/DenglSteel/coElv2 into test-branch-as

Conflicts:
	Gemfile
	Gemfile.lock
	app/views/static_pages/home.html.erb
Merge pull request #2 from DenglSteel/test-branch-as

Test branch as