Sentences with the structural form of "Some random text here.[1] It will be not parsed correctly".
Since for a proper sentence we expect a space after the full stop, this kind of sentences are not extracted properly.
Adding a regular expression 	$result=preg_replace("/\\[\d*\\]/", "", $content); to avoid such sentences.
Merge branch 'master' of https://github.com/hritupon/wikitimeline
for better sentence extraction.