add solr.SolrPage.highlighting

[GoogleCodeExporter]

I should have done these as one commit, but I was playing around with editing 
the code with the web interface on here.

modify page_range def to return highlighting
http://code.google.com/r/briantinglecdliborg-solrpy/source/detail?r=695579c7844f
c672a585d1ee75d51ee61b966046

modify SolrPage class to have a .highlighting
http://code.google.com/r/briantinglecdliborg-solrpy/source/detail?r=fd09f87837e2
522b71ab5b917a00186864ad3fde

Original issue reported on code.google.com by brian.ti...@gmail.com on 7 Jul 2011 at 9:42

[tingletech]

#36