added Vizier custom constraints query tool
made the tablelist repr use print_table_list by default
print out table #'s too
fixes in formatting, also added table numbers
simplified empty table __repr__
remove trailing newline from __repr__
fixed tests related to table printing
Merge pull request #148 from keflavich/vizier-custom

Add Vizier constraint-based query tool
Merge pull request #147 from keflavich/tablelist_prettier

Make TableList more convenient to work with
Added basic code
rename to core.py
works with process_asyncs decorator except for verbose argument
minor fixes to get process_asyncs work with this
Added docstrings to methods, some changes in process_asyncs
Made items configurable
added tests
Added data for tests
added setup_package.py
minor fix in tests - now passing
fixed issue with table reading