refactor(doc): changed location and text for link to the build SHA for issue #235

Closes #235
fix(demo): tab demos improved layout and accessibility

Tab demos
- use internal tab content views to auto- inject ARIA features
- fixed to layout tab buttons properly
- fixed to paginate only when necessary.
- support arrow key navigation and autofocus of selected tab;
- synchronized key tab selection with tab content.
enhance(tests): Removed deprecated $throttle test with canvas inkRipple
fix(iterator): update add()/remove() logic

Implemented Jasmine tests `iterator.spec.js`
fix(material-dialog): Focus mgmt, ARIA attributes
test(dialog): Adding test coverage for ARIA