Merge pull request #7 from MarkWatkins2014/master

Add general tensor_get_an()
root_number_at_oo (as mod 4 result)
Merge pull request #8 from MarkWatkins2014/master

root_number_at_oo (as mod 4 result)
Updated interface for tensor products
Merge branch 'master' of https://github.com/mjd95/lmfdb
some work on tensor products
Merge branch 'master' of https://github.com/mjd95/lmfdb into mine

* 'master' of https://github.com/mjd95/lmfdb:
  Updated interface for tensor products
  root_number_at_oo (as mod 4 result)
some progress
start the day with coffee