fixes a small bug that prevented changes in the comment symbol on writing

closes #790
change name of parameter back to comment
Added table.copy() method. Closes #965
Fix for issue #696
Merge pull request #1209 from gabraganca/master

Close #1157 : Make the Astropy logo linkable.
Merge pull request #1208 from ChrisBeaumont/table_copy

Added table.copy() method. Closes #965
Merge pull request #1213 from ehogan/fix-issue-696

Fix for issue #696
Merge pull request #1167 from hamogu/fix790

fixes a small bug that prevented changes in the comment symbol on writing