Release of 1.4.7

- 24d01699e205e3d7ba3f65000c85103c6f6e8e83: Merge pull request #783 from mattrjacobs/upgrade-rx-1-10
- d263309e389122983c3071cdb58a6c929b33a5c4: Upgrade RxJava to 1.0.10
- 99e3172a767129fbfd83acda0d2cffb10dcb7976: Merge pull request #781 from mattrjacobs/shorten-collapser-stress-test
- e73d9c8a009ea24a7833c44239de55364ddb7103: Shorten stress test of HystrixObservableCollapser from 1000 -> 100 to limit OOM problems
- 57df50b7e862741ca0900d369de4159e969dbecd: Merge pull request #780 from mattrjacobs/allow-hooks-to-throw-safely
- 56e5664b562458efed0ac6d5bbfe641e02bd9b3d: Incorrect log messages
- 92ecdac4da0e52cb79f9160c2273bc718d169dee: More precise solution to #771
- eef7eb3ee8fa7255229701bb61843e863443e290: Revert "Handle hook failures more gracefully"
- 1114a5b47271c0383dd8767560addab10cdacbcb: Revert "Add try-catch to all hook executions"
- 89c25695926ebc3cef69b577540d2f8aa1bc495b: Merge pull request #779 from mattrjacobs/rebased-hdr-histogram
- e7c9e987a8efcd208ebcfd99167c191d39930783: Merge pull request #778 from mattrjacobs/more-forks-for-jmh
- a364a3d83f3bf675ad0b459f8e216c4a21acbb1a: Update CHANGELOG.md
- e3ea42521a3f7f8c1af560f2b5115c82f6b24ebe: Replaced internal data structure of HystrixRollingPercentile with HdrHistogram * Also fixed some incorrect assertions around how percentile was being calculated
- 2779e89ea9ea18e946604063963a472a2ede4c7d: Added dependency on HdrHistogram 2.1.4
- b3f6b019cc51e64e3e376e59f6424e09cf42ea8c: Use more forks and less iterations/fork in JMH config
- b552e667f54d5ef9acdb174cffc60059a743a593: Merge pull request #776 from mattrjacobs/add-bad-request-to-dashboard
- 892f6a781e67f153b0bf2f7387c87ca0721955c2: Added Bad Request count to Hystrix dashboard
- 473a531f7135bcd8534d7176494d30047c92fef0: Merge pull request #775 from mattrjacobs/add-counters-for-hystrix-quantities
- f94ce744f9d57f7194a4133388eae47796662c41: Add HystrixCounters methods to return number of commands/threadpools/groups
- f5a605f99443db3f331183682760563b92853520: Merge pull request #774 from mattrjacobs/add-concurrent-hystrix-thread-metric
- dd5fba4edc007a5f42db9e730225671bf10da26f: Added HystrixCounters to hold global metrics on Hystrix behavior
- 4ca3b230d0b9eaa26b7f0b8e0861f2048610f141: Update CHANGELOG.md
