[ts.manip.ncdf] typo bugfix in format specifier
[ts_iter_numpy] Catch error on image read failure
[ts_iter_numpy] log on image read failure
[ts.manip.ncdf] skip image if imread fails

If imread fails, we now skip the image entirely, instead of raising an
error.
[netcdf] Rewrite image parsing
[ts.parse] break out a function to read image

Now, we have a seperate function to do the reading of images, we don't
just use iter_numpy with a slice. And now, iter_numpy is just a wrapper
around this.
Fix rename of colorcard to ccd in pipecomponents

This reverts the issue joel raised here:

https://github.com/borevitzlab/timestreamlib/commit/8eb6579529b0eeeadac131dd08fc611e653918b5#diff-7f25bbd35d62ff5e458c75ec35904540R187

Changes to be committed:
	modified:   timestream/manipulate/pipecomponents.py
Merge branch 'dev' into next

Conflicts:
	tests/data
	timestream/manipulate/netcdf.py
	timestream/parse/__init__.py