enabeled sunspot task when running with Rails 4
Merge pull request #380 from hsbt/enabled-rails4

Feature detecting rake task support instead of using version string. Enables sunspot task when running with Rails 4.
Update AS instrumentation to match RSolr 1.0.7

Improve instrumentation log readability

Quote string values and remove query escaping.
Merge pull request #377 from felixbuenemann/fix-activesupport-instrumentation

Fix ActiveSupport instrumentation
Update travis and gemfiles so now runs the latest Rails version in all cases
Merge pull request #428 from sunspot/test-with-latest-rails

Update travis and gemfiles so now runs the latest Rails version in all cases
Merge branch 'master' of github.com:sunspot/sunspot