BUG: fixed typo in read_cfradial functions
BUG: fixed bug in add_field_like radar method

add_field_like method of radar would overwrite the old field's data and
metadata since a copy was not made, this correct this behavior.
Merge remote-tracking branch 'arm_doe/master'
STY: remove trailing whitespace in default_config.py
Merge pull request #139 from jjhelmus/master

BUG: Fixes for two minor bugs