Changed function names to use underscores

As mandated by PEP8, and suggested here:
http://www.reddit.com/r/learnpython/comments/1f3j64/code_critque_please_github/ca6ge1f
Also, shortened the docstring in term_resize, to comply with PEP8's max
line length of 79 chars. Whether you want to do the same with term_size
is up to you.