Changed line to delimiter=delimiter in csv.writer
Added test for delimiter=None case in test_write.py
Removed additional spaces in keyword arguments. fixes#957
address #910 (fill_values in astropy.io.ascii.write)

This implementation solves the problem discussed in #910.
I suspect that it costs some performance for large tables (I did
not actually perform tests for that), because I replaced an
iterator with an explicet list.
However, in this way most of the fill_values logic can be reused
from the implemention of fill_values on input.
modification as discussed in pull request
add more assert statements to tests
Fix typo
Allow vector operations between Time and TimeDelta
Remove orphaned code
Remove a non-existent arg 'opt' from the Time docstring
Add __getitem__ to Time
Update to keep jd1,jd2 as arrays, check/set is_scalar, and also slice
the two _delta's
PEP8 fixes to astropy/table
PEP8 fixes in astropy/nddata
PEP8 fixes in astropy/nddata/convolution/tests
PEP8 fixes in astropy/config
PEP8 fixes in astropy/cosmology
PEP8: Fixed a few long lines
Further tweaks to __getitem__, making error message clearer and order better
Tests and documentation update