setting the responsive nav dropdown zindex to be equal to the editbar so checkboxes dont crash its partay.
Merge pull request #579 from evancooper/checkboxes_crashin_ma_nav_party

Setting the responsive nav dropdown zindex to be equal to the editbar so...
closes #302 formatted attribute sets
Merge branch 'master' of github.com:concrete5/concrete5-5.7.0
image slider - adding edit mode placeholder, making modal jump down to freshly added entries, fixing stacking delete click events, and adding arrow sort functionality