Updated Python Nose (rest)

adding example.

Uniform headings

W. Trevor King: I dropped everything from the original f7bd97a except
for the Python-10-Testing-your-program.rest modification.

Conflicts:
Python-5:-Strings-and-File-I-O.rest
Python-6:-Object-oriented-programming.rest
Python2-ListsDictsSetsTuples.rest
Python3-FlowControl.rest
Python4-FunctionsAndStandardModules.rest

Finished formatting the testing lecture.

Imported Nose lecture and started cleaning.