v 1.5.0. Faster pop.
Added benchmarks and tests for new pop implementation.
On branch master
modified:   Readme.md
new file:   bench/evict-all-2^24-items-with-multiple-shifts-bench.js
new file:   bench/evict-all-2^24-items-with-single-pop-bench.js
new file:   bench/evict-half-2^23-items-with-multiple-shifts-bench.js
new file:   bench/evict-half-2^23-items-with-single-pop-bench.js
new file:   bench/evict-side-case-with-multiple-shifts.js
new file:   bench/evict-side-case-with-single-pop.js
modified:   bench/push-array-2^24-items-bench.js
modified:   bench/push-train-2^24-items-bench.js
modified:   bench/run.sh
modified:   bench/shift-array-2^16-items-bench.js
modified:   bench/shift-train-2^16-items-bench.js
modified:   bench/shift-train-2^17-items-bench.js
modified:   bench/slow-shift-array-2^17-items-bench.js
modified:   lib/train.js
modified:   package.json
new file:   slow-shift-array-2^17-items-bench.js
new file:   test/pop-test.js
modified:   test/run.sh