'baked_args are defaults for the \'sh\' execution context.  for
example:
tmp = sh(_out=StringIO())
\'out\' would end up in here as an entry in the baked_args dict'

def __init__(self, globs, baked_args={}):

    self.globs = globs
    self.baked_args = baked_args
    self.disable_whitelist = False
