feat(progressbar): make widget accessible

 * Add WAI-ARIA markup.

Closes #1717
style(License): update copyright year range
Merge pull request #1731 from gdi2290/patch-1

style(license): update copyright year range
fix(readme) fix typos

Closes #1757
docs(readme): fix typos in readme and contributing guidelines

Closes #1762
fix(alert): add `alert-dismissable` class

Closes #1745
feat(dropdown): add WAI-ARIA attributes

 * Add `aria-haspopup` and `and aria-expanded` attributes to dropdown toggle.
 * Dynamically change `aria-expanded` when the dropdown closes or opens.

Closes #1733
demo(timepicker): update to angular 1.2.x

Closes #1755
fix(pagination): take maxSize defaults into account

Fixes #1728
Closes #1738
refactor(build): modular, gulpfile, bower