Build Table added
Fixed the vstack Table type issue
Imported astropy.units
Fixed minor issue
Added alternative time format
Now adding record using add_row
make vso table printing much better.
Make `.show()` print out the str rep.
Add __repr__
Update CHANGELOG.md

[noci]
Somekind of tests
no .table attribute
fix syntax error
Tidy up the code and remove show references from the docs.
Merge pull request #1193 from Cadair/vso_issue

[Review]: Change VSO QueryResponse.show() to __str__