Release of 1.4.8

- cb72b9433bf735384aae545631fd8bff39fd096b: Merge pull request #797 from mattrjacobs/take-histogram-off-multithreaded-read-path
- d66dae4768034a83c14bac6c6e0e85bb6968b27f: Move all reads of Histograms to a single-threaded path.  Either cache the commonly-accessed summaries at construction, or  support arbitrary calculations via a synchronized path
- 3246e46f18ee533db1a0c9dca6881ae7c8cb9ed8: Merge pull request #794 from manuelbernhardt/patch-1
- 9e1eb947b4c8e7082d893f54f240bfd21efeabe4: Monitoring stream on keypress
- 9002320880c12c4f52452e05e1d5ef1a8a44316d: Merge pull request #787 from motortalk/reject-stream-servlet-request-when-destroyed
- 5c2375ace70cef3c00cea9e63993472089fd587f: added copyright header
- bc3e75fe5359420c62e3e45e54204a9711851b65: Reject requests after servlet shutdown (fixes #786)
- dc06181e7d5e978b953910fd50c8e93ab72e6886: Merge pull request #785 from beckje01/updateMetrics
- 92c4fb00313f5e98b879fd7e33083438b3bf964e: Update metrics to the latest version
- b5e7459657172133268de46b474db902343abad6: Update CHANGELOG.md
- b11f787ebfe2bcc83d1f601626dd2c626822fa9e: Update CHANGELOG.md
