Read params from element data-* attrs
Add data attr section to README
Update simple example to use data attrs
add package.json
Merge pull request #13 from secondplanet/master

Add package.json
Merge pull request #12 from josh/data-attrs

Support data-* attr params
use positive or negative multiplier for inversion internally, that way conditions testing for negative are not necessary anymore
handle inversion multiplier in all cases
rename inverter to inversionFactor since that's the correct term :)
restore default value for invert
use DOM element comparison rather than ID comparison; that way elements without an id attribute do not get registered again when their plax params are modified
Mutate using top/right/bottom/left position properties as declared to maintain position even in the event of resizes
allow animation of backgrounds using background-position
Merge pull request #14 from dzuelke/backgrounds

Allow background position animation, support right/bottom positions, use inversion factor in calculations, allow repeated init of elements without ID attribute
Fix #15
Detect element position, then override positioning method

This is to fix #15 in a better way, and fix another bug in FF that the
previous fix caused.

Firefox appears to set explicit values for top, right, bottom, and left
values, regardless of what is actually specified. This negates the
ability to use `.css('left') != 'auto'`. This method, rather than
detecting how the element position is set, figures out where the
element is, then repositions it using top/left based on the original
position.
remote test file
change docWidth -> plaxTargetWidth
Whitespace
Add `target()`