fix RESP epoch time lookup in evalresp (was only using the date and thus
failing for RESP files with very fine grained epochs)
changelog
modify setup.py: get rid of distribute specific code;
Merge pull request #659 from petrrr/fix_0.8.4_setup

Minor change to setup.py (0.8.4 release)
Merge pull request #632 from obspy/fix_evalresp_datetime

Fix evalresp datetime