Upgrade Apache Solr to 4.5.0 and PySolr to 3.1.0.

All Solr indexes will need to be re-created.

java/solr/server/solr-webapp/webapp/img/filetypes/README

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+http://www.splitbrain.org/projects/file_icons
+
+Released to the Public Domain
+Free to use. Provided as is. No warranties.
+
+Note: The big majority of icons where created by the creators listed
+      below. Only a few ones where found on the net. They were too
+      widespread to determine the original author and thus were
+      considered public domain.
+      If you are the author of one of those icons just send a short
+      mail to either be included in the list below or have the icon
+      removed from the package.
+
+Creators:
+
+  Andreas Gohr <andi@splitbrain.org>
+  Michael Klier <chi@chimeric.de>
+  Andreas Barton <andreas.barton@web.de>
+  Hubert Chathi <hubert@uhoreg.ca>
+  Johan Koehne <johankohne@gmail.com>
+  Rudi von Staden <rudivs@iafrica.com>
+  Daniel Darvish <ddarvish@hibm.org>
+  Andy Pascall <apascall@engineering.ucsb.edu>
+  Seth <seth.holcomb@gmail.com>
+  David Carella <david.carella@gmail.com>
+  Tom N. Harris <telliamed@fastmail.us>
+  Brandon Carmon Colvin <b.carmon.colvin@gmail.com>