Edmundson's method is composite of 4 methods

Edmundson's method is weighted results of
4 specific methods: Cue, KEy, Title, Location.
Py3k compatible import of 'urllib'
Paragraph may contains only 'Sentence' instances
Better string representation of 'Paragraph'
Require numpy & scipy only for LSA
Added simple plaintext parser
Added separate tokenizer of sentences & words
Python 3 is not supported yet :(
Added precision & recall evaluation #1
Typos
Added F-Score evaluation #1
That was so much useless C&P