Adds Solr stats
Adds stats docs to Readme
Refactors stats code to be more in line with facets
Adds reference support for stats facets
Fixes syntax error on Ruby 1.8.7
Fixes another 1.8.7 syntax error
Fixes remaining 1.8.7 issues
Small change to trigger new travis build
Typos in README.md
Merge pull request #514 from mike-stewart/typos

Typos in README.md
Merge pull request #503 from fivedigit/stats

Adds Solr stats support
Merge pull request #507 from mdx-dev/feature/order-by-function-types

Accept non-string literals when ordering by function.
Merge branch 'master' of https://github.com/sunspot/sunspot