Fixed typo in example

It should be `css_class` in the template tag example instead of just `class`. (It is mentioned correctly in the syntax line earlier).
Merge pull request #1025 from reinout/patch-1

Fixed typo in templatetag docs example (thanks to @reinout)
Update Xapian install
Fixed the installing search engine doc URL
Link to 'signal processors'
Merge pull request #1047 from g3rd/patch-1

Update the installing search engine documentation URL (thanks @g3rd)
Merge pull request #1050 from jogwen/patch-2

Documentation: add a link to signal processors in search index
Docs: fix signal processors link in searchindex_api

Correct a typo in b676b17dbc4b29275a019417e7f19f531740f05e
Merge pull request #1044 from areski/patch-1

Update Xapian install instructions (thanks @areski)
Add PyPy targets to Tox & Travis

Closes #1049
Update example for Faceting to reference page.object_list

Instead of `results` - ref #1052
Merge pull request #1053 from gandalfar/patch-1

Docs: update Faceting example with correct template context (thanks @gandalfar)
Fallback to pwd if realpath is not available
Merge pull request #1055 from andreif/feature/realpath-fallback-osx

Tests: Solr test server script now handles OS X without realpath / coreutils (thanks @andreif)
Travis, Tox: add Django 1.7 targets
Update Travis & Tox config

* Tox: wait for Solr to start before running tests
* Travis: allow solr & pip downloads to be cached
* Travis now uses start-solr-test-server.sh instead of travis-solr
* Test Solr configuration uses port 9001 universally as per the
  documentation
* Change start-solr-test-server.sh to change into its containing
  directory, which also allows us to remove the realpath dependency
* Test Solr invocation matches pysolr
    * Use get-solr-download-url script to pick a faster mirror
    * Upgrade to Solr 4.7.2
Tests: don't suppress Solr stderr logging

This will make easier to tell why Solr sometimes goes away on Travis
Mark 2.2.X as incompatible with Django 1.7
Analyzer function can be choosen for Whoosh backend