add masonry column shift layout mode
docs : methods : missing _not_ in methods

thx Flo!
src : strict mode enabled

v1.5.12
docs : help : disable transforms for text artifacting

Ref #154
add `-ms-transition` CSS
src : round x and y values in _pushPosition

Fixes #157

v1.5.13
src & docs : add containerStyle option

fix iteration but in ._destroy()

v1.5.14
src : prevent no $el when checking for transition
Webkit browsers return NaN if padding attribute(s) are not set, causing isotope to stack elements on top of each other instead of positioning correctly.
src : move remove callback into removeContent

add add/remove button to remove demo

v1.5.15

Closes #139
src : merge rounding; v1.5.16
src : remove trailing whitespace
docs : license : clarify what a developer is

tick copyright year
Merge pull request #166 from ryanza/patch-1

src : Webkit browsers return NaN if padding attribute(s) are not set
src : tidy up padding in offset
README : tick copyright year
docs : intro : fix -ms- vendor prefix
docs : animating : add no-transition styles

Ref #170
css : use refined gradient syntax
Merge branch 'master' of github.com:desandro/isotope