Change parallax plugin to use asset pipeline

fixes #47
Signed-off-by: Heriberto Perez <heriberto.perez@crowdint.com>
Fix kiitos gem dependency
Signed-off-by: Heriberto Perez <heriberto.perez@crowdint.com>
Merge pull request #52 from crowdint/more-bug-fixes

Change parallax plugin to use asset pipeline