Get Solr-4.5.1 from Apache archives

As of 1/28/2014 Apache mirrors offered only Solr-4.6.0 and 4.6.1. Test of Solr-4.6.1 failed (see issue #58). Reverted to Solr-4.5.1
Corrected path to Apache archive of solr-4.5.1.tgz
Merge branch 'issue56'
to fix issue56.
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