initial fragment rewrite
use new fragment nav method from slide()
fragment comments, remove debug code
fragments are now zero-indexed
rewrite fragment index attributes to leave no gaps between fragments
respect original dom order of fragments with no explicit index
rename markdown tests to use same naming format as other tests
remove current-fragment when leaving slide, add tests for current fragment
rewrite fragment sorting to account for multiple fragments with the same index
rewrite all fragment indices on startup
additional fragment tests
update future classes when syncing
Merge pull request #721 from hakimel/refactor/fragments

Refactor fragments