Can't use StripTransform in .yml file

[veggiemike]

Ahoy @davidpablocohn!

I just realized I cannot use a StripTransform in v1.9.0. It looks like it's never imported by listen.py. A quick audit revealed the following lines appear to be missing from the top of listen.py... Any reason any of these were excluded (e.g., they don't actually work)?

from logger.transforms.delta_transform import DeltaTransform
from logger.transforms.derived_data_transform import DerivedDataTransform
from logger.transforms.format_transform import FormatTransform
from logger.transforms.interpolation_transform import InterpolationTransform
from logger.transforms.nmea_checksum_transform import NMEAChecksumTransform
from logger.transforms.regex_replace_transform import RegexReplaceTransform
from logger.transforms.select_fields_transform import SelectFieldsTransform
from logger.transforms.split_transform import SplitTransform
from logger.transforms.strip_transform import StripTransform
from logger.transforms.subsample_transform import SubsampleTransform

I've imported all of them on my server and things seem to work, although I've honestly only tested StripTransform.