refactor($materialAria): rename $aria to $materialAria
chore(ngAria): add ngAria
refactor(checkbox/switch): use ngAria
chore(deps): update angular to rc.3
chore(): Add ngAria to project
demo(sidenav): adde a component id to the example to make it work

Closes #338
docs(README): add period('.') to two sentences

Closes #329
chore(build): copy src sass files to dist for bower-material

Fixes #4. Closes #326.
docs(button): incorrect description

replace `radio button's text` by `button's text`

Closes #313.
fix(): Adding better warnings to material.aria
feat(): Delay aria.expect for ng-bind content