Release of 1.4.12

- 14a4611402465b37182bdc836cefffb6affef8b2: Merge pull request #826 from mattrjacobs/safely-handle-negative-delay
- a2b2dc65ad4d71d0d17990308b82e4602f3fcd5b: Safely handle negative input on the delay input to metrics-stream
- 61152a0a27ab3ad8e0f51d210d149acadbf6841d: Merge pull request #825 from mattrjacobs/remove-bucket-resizing-rolling-number
- dbd322698b2669ee1962a211fe58e545166b3a29: Only allow bucket configuration to take effect on HystrixRollingNumber creation
- 75f663d193b2ab18668f5818c99f0815eb442a91: Merge pull request #824 from mattrjacobs/remove-bucket-size-recalculation
- b33622a5e50c46d7d747440c4913a9121b3b17cc: Make values for HystrixRollingPercentile bucket calculation only affect construction, and never runtime.
- 97749b78d61a91297a56a716373049f4cf5e1ef0: Merge pull request #823 from fhopeman/master
- faa146e0bea7ba796a810065f5bc4ec5d834f2c5: fix half hidden mean metric because of container height
- 0e8fc7ca573f91f4cda4bf089ee20ddec288da87: Merge pull request #818 from mattrjacobs/only-check-max-queue-size-prop-on-thread-pool-init
- dbf913f4a3562bd00105736adff61b912af707c1: Modify logic to only check the dynamic maxQueueSize property on creation of a threadPool
- d561dcb2ebb8ac0ea29e517811323933dbf72590: Update CHANGELOG.md
