Pylint suggested changes; remove unnecessary shebangs.

pylint command line: pylint -d mixed-indentation,anomalous-backslash-in-string,missing-docstring,invalid-name,cyclic-import,line-too-long,unused-argument,redefined-outer-name,too-many-arguments,bad-continuation,unbalanced-tuple-packing,logging-not-lazy,bare-except,no-self-use,maybe-no-member,unbalanced-tuple-unpacking,broad-except,dangerous-default-value,too-few-public-methods,fixme,no-member,star-args,too-many-public-methods,too-many-instance-attributes,too-many-branches,unused-variable,global-variable-undefined,protected-access,import-error,bad-builtin,raising-bad-type *.py