update(changelog): added information on  API improvements
update(changelog): fixed code highlight section
fix(mdRadioGroup): preserving tabindex

removed noInk attribute on radio button.
Closes #602
release: version 0.6.0-rc1
refactor(inkbar): use scale & percentage calculations for more robust transition
feat(mdAria): checks child nodes for aria-label

Closes #567. Close #674.
update(ripple): centers the md-fab ripple and updates the main template to correct ripple directive

Slow down the ripple's movement towards the center to make it more obvious that the ripple is coming from the mouse cursor.
Rename the diagonalWidth to rippleWidth to be more descriptive.

Close #686.
enhance(ripple): improvements to API, sideNav list items, and button effects

add md-ripple-active support for nav active state,
add support for ms-ink-color to set a custom ink color, cleans up attribute names and re-arranges code,
rename method to be more consistent with our naming conventions,
add test for custom ripple ink color,
allow invalid entries for md-ink-ripple to be ignored,
change internal code for checkboxes and radio buttons to use md-ink-ripple-checkbox

Close #689.
Merge pull request #3 from angular/master

Update @0.6.0-rc1