export the IndexSet as a top level object instead of being namespaced
fix tests that changed with removing the IndexSet namespace
make lastIndex reflect the actual last index in the set

- SC's max is unintuitive- use the Cocoa lastIndex
  instead
satisfy tests for lastIndex
rebuild browser components
add tests for rangeStartForIndex
add some, every, someRange, and everyRange
add set intersection and contains tests
add tests for firstIndex
uncomment tests for the lastIndex
add notes about the internal data structure
rebuild browser version