Added col and rowspan attributes. Added drag and drop attributes.
Switched attributes' names to lower case.
Revert "Switched attributes' names to lower case."

This reverts commit dcd0f07220b2c451ce4173dd7a83fc2b3745a157.
Switched attributes' names to lower case.
colspan and rowspan with correct casing
Merge pull request #61 from sergiusignacius/master

Added col/rowspan and drag&drop attributes.