Summarize class object

easy-to-use API in python courtesy of a class object:

from textsum.summarize import Summarizer

summarizer = Summarizer() # loads default model and parameters
out_str = summarizer.summarize_string('This is a long string of text that will be summarized.')
print(out_str)

What's Changed

• Summarizer() class object by @pszemraj in #3

Full Changelog: v0.0.5...v0.1