Changes related to importing of Table tags. Many of these areas will need to be refactored since tables do not fit in the TLF model
Added method to parse table cell elements to BaseTextLayoutImporter
Added table header to import element which just uses table cell importer
Added getTextFlowContent method temporarily for testing import of table data contents. This will be removed when things are working.
Added removeAllRows and removeAllRowsWithContent to TableElement
Fixed bug where child of TableElement throws error if mxmlChildren is not TableCellElement
Updated canOwnFlowElement to accept table element types for support import methods.
Added cells, addCell and addCellAt to TableRowElement
Added import of simple table data, remove all rows to TableExplorer
Merge branch 'master' of https://github.com/Harbs/TLF-Table-Work

Conflicts:
	flex-tlf/textLayout/src/flashx/textLayout/elements/CellCoordinates.as