Improve support for syntax highlighting linenos=table option

[mchelen]

The {% highlight %} tag for syntax highlighting works fine:

Line numbers can be added using linenos:

With linenos however the line numbers are selected when trying to copy the code. This can be fixed by using linenos=table but this is not handled in the theme styling:

Reference: http://pygments.org/docs/formatters/

[mmistakes]

This has been fixed and will be landing in #265 once merged.

[mmistakes]

3.0.1 has been released with this fix.