Update wcs method names
Merge pull request #31 from cdeil/fix_wcs_error

Update wcs method names
added .write function to ShapeList
fixed comment issue (if no comments, crashed!)
fixed comment issue (if no comments, crashed!)
previously crashed if there was a region without a
comment
Updated write() to include attributes in case they are modified
updated init's write function to include attributes
added compatiblity with DS9 6.2
added projection, segment, and reading thereof
also, vectors can be read now (not ignored as comments)