Fix properties with default value = true, add group options #7
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Fix properties with default value = true
Polymer properties with default value = true have to use Type: Object, otherwise it will not work.
See also: Polymer/polymer#1812 (comment)
Support group options:
Two additional published properties 'push' and 'pull'
Quote from Sortable Wiki https://github.com/RubaXa/Sortable/wiki/Sortable-v1.0-%E2%80%94-New-capabilities:
pull — an ability to “pull out” elements during their movement between lists; also this property may have clone value;
put — an ability to accept an element from another group, or an array of permitted groups.
In order for clone to work the element properties are also explicitly copied on sort-start (Polymer/polymer#2112).