Switched summaries to new quantile package.

Change-Id: I6f5727181ba332aa9c9046995ef511516da2d44d
More summary tests. WIP.

Change-Id: I8554733eb2c910857e9c6e2cdc8db4c20d19d886
Rename BenchmarkPrometheus... -> Benchmark...

Change-Id: I242cbb8bfba5a28ce43048366c6e940a386ea1de
Recycle mergedAllStreams.

Change-Id: I290e4236bfba55c7853148c28f803baea2339327
More summary tests.

Change-Id: If31ec11bc608d2aabf46368e4e727bca739ae813
Enable collect checks in handler test.

Change-Id: Ifcb15139fa725f9e65c6de05d193d22f9ee42049
More vec tests.

Change-Id: I4430a5932d5c73cb6e212abd1ada16cc61763c52
Moved examples into doc.

Change-Id: I6e8695eacb8d4ad4772864f8183dd2ae32facc92
Documentation. WIP.

Change-Id: I6f653ccfc3eb5c9f1c9a3cd1533341307e4ad97b