Add option to add unique prefix to footnote references #55
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Setting footnote prefix: ParsedownExtra::setFootnotePrefix( string $footnotePrefix )
This should be a string that is valid in an HTML attribute, i.e. escaped properly.
Default value is blank, if this is kept blank behavior is as before.
Use case in mind is for something like a blog, where you can set the prefix to something unique like a post ID.
Added test_footnote_prefix() to test cases.
fixes #50