add command line script obspy-print to print waveform data contents of local waveform files
changelog
small refactoring signal + removing deprecated stuff
should fix issue #576
trying to speed up mchedr tests a bit ...
preparing 0.9.0rc1
Merge remote-tracking branch 'origin/obspy-print'

Conflicts:
	CHANGELOG.txt
warning message in Response.get_evalresp_response

see https://github.com/obspy/obspy/pull/590#issuecomment-30107680