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.
Merge branch 'vso_issue' into nab_unidown
use astropy table to print out query results.

Conflicts:
	sunpy/net/unifieddownloader/downloader_factory.py
Merge pull request #1 from Cadair/nab_unidown

Nab unidown