added `linespans` option to HtmlFormatter to wrap lines in spans

#82 Merged at 34ba9b4
Repository
icholy
Branch
default
Repository
birkenfeld
Branch
default
Author
  1. Ilia Choly
Reviewers
Description

If set to a nonempty string, e.g. foo, the formatter will wrap each output line in a span tag with an id of foo-linenumber. This allows easy access to lines via javascript.

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