Reorganization of slidesModule. API Change!

- Removed transitions
- Removed default fade in slidesModule
- Added currIndex to callback
- Made demo more awesome

This change means that all visual transformations must be done outslide
the slides module. Flex gallery has a basic fallback to fade in/out. The
demo illustrates use of currIndex/index to change transformation based
on direction.
Merge branch 'master' into gh-pages