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.
fix(demo): static tab demo now uses

Close #699. Thx @PaulMougel
chore(): cleanup readmes and module.json files
fix(): Landing page fixed in IE11

Close #711.
fix(docs): add 1-frame delay to syntax highlighting.

Refs #718
update(docs): improvements to code highlighting

Refs #718.
wip(): add gt- attrs