Revert "Merge pull request #389 from newrelic/RUBY-1273-dirac-guids"

This reverts commit f6c656836154a8c31150e04a87630e68b30db952, reversing
changes made to da5c80687b86a8a26c615cdbf3a8b5b5355d2286.
Updating signing cert
Revert "RUBY-1274 Record host on analytics events"

Proposed changes on the collector make sending this on the events unnecessary.

This reverts commit a625c291f3fd753bcc6441f670aa6066b3f4434b.
Add new AR instrumentation test

These will soon replace the existing tests which are too loose in their asserts
and messy with regards to versions and platforms.
Fix for exists? checking on < Rails 3.2
Fixes for new ActiveRecord tests on 2.3
Fix for Rails 4.0 HABTM

http://ruby-journal.com/rails-4-changes-join-table-naming-convention/
Find transaction segments more flexibly

Rails 4.x has a slightly different (but still valid) nesting for the
transaction segments. This lets the test be flexible about it.
Bye-bye old ActiveRecord tests
Merge branch 'dev' into active-record-instrumentation-tests

Conflicts:
	test/new_relic/agent/instrumentation/active_record_instrumentation_test.rb
Renaming ActiveRecord test file

Don't collide with old file for easier reading in diff.
Align with production file naming.
Tests for Datastore/all and Datastore/allOther
CHANGELOG update for new certificate
Merge pull request #400 from newrelic/CHANGELOG_3.7.2_cert

CHANGELOG update for new certificate
Version bump to 3.7.3
Merge pull request #398 from newrelic/active-record-instrumentation-tests

Active record instrumentation tests
Merge pull request #394 from newrelic/RUBY-1274-no-host

RUBY-1274 Revert Record host on analytics events
Update to Rails 4.1 RC1
RUBY-1273 Reset CAT-related state on the TransactionState when it is reset
Merge pull request #401 from newrelic/RUBY-1273-transaction-state-reset

RUBY-1273 Reset CAT-related state on the TransactionState when it is reset