Add Simplified Chinese translation from GongT for Issue #185
Added 'hidePaletteAfterSelect' option.

In order to simply switch between more palette presets the
'hidePaletteAfterSelect' options was added to optionally prevent the
palette from closing after one preset was selected.
rename to hideAfterPaletteSelect, change default, add docs.  Issue #238
add test for hideAfterPaletteSelect:true
Merge pull request #193 from bgrins/zh-cn

Add Simplified Chinese translation from GongT for Issue #185
add unprefixed linear-gradient.  Fixes issue #240
cleanup and add tests for draggable()
prep for 1.5.0