Please consider rewrite the README for clarity on examples.

[phucly01]

I haven't look at the entire README but the section of using sed as python module isn't very clear.
For example what does load_script() do? the file to be sed or the file containing match/replacement strings? If it is one of the two, how is the other one supplied? Consider giving a practical example instead of hypothetical one. For example, sed a string "This needs a better example" to "This is a better example"