fix(tabs): properly style ios tabs-top

Breaking Change: SCSS var $tabs-striped-off-opacity has been renamed to $tabs-off-opacity
Merge branch 'master' of github.com:driftyco/ionic
fix(tabs): don't show color for active android tabs
fix(buttons): update clear button text weight to match native styles
Merge branch 'master' of github.com:driftyco/ionic
amend(buttons): only adjust back button font weight
refactor(transition): update android transitions
update circleci badge
Merge pull request #2706 from worldsoup/update-circle-badge

docs(): update circleci badge
chore(update): upgrade to Angular v1.3.6
fix(cache): remove between histories using maxCache(0)
chore(update): upgrade to UI-Router 0.2.13
fix(tabs): removed active color inherit for tabs striped
fix(item): option button enables swiping
feat(items): better item remove animations
amend(tabs): prevent footer from having tabs top and re-add $tabs-striped-off-opacity
test(header): has-tabs-top test accounts for footer