Merge pull request #69 from eshon/master

Adding 'Add more geoms' button and proto-WKT/GML input box to geom inuts
redraw after creating input link (see #69)
do not use input value if value is taken from drawn geometry (see #69)
put a semi-transparent fill on the output polygons (closes #67)
WIP for #34
Adding tabs to indicate either text or map input but not both