fix tests for python3: use relative imports in tests (see astropy
   issue#1256), avoid import of pyvo in setup.py,
vao.py: split_str_array_cell(): fix setting delim for python3
fix tests for python3.3: do not assume order on sets/dict keys:
sesame.py: enforce documented support for order of dbs
query.py: format parameter is preferred order
Merge pull request #27 from RayPlante/quickdev

fix tests for python3