IMHO incorrect work LexRankSummarizer from alex grig

[miso-belica]

Hi!
I will be brief, so as not to distract.

When working algorithm produces a row the first proposals from the text.
for example: LexRankSummarizer: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] (numbers are the sequence number proposals in the in the source text.)
Alternative implementation https://github.com/TafadzwaPasipanodya/Nutshell gives the following result on the same text:
Results LexRank: [94, 57, 42, 76, 66, 86, 83, 63]

Regards Alexander