Added benchmarks for js-search (latest and local) and Lunr

Author: Brian Vaughn

.flowconfig

@@ -1,2 +1,5 @@
+[ignore]
+<PROJECT_ROOT>/benchmarks/.*
+
 [options]
 unsafe.enable_getters_and_setters=true

benchmarks/.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+/.bower
+/.idea
+/bower_components
+/node_modules
+/npm-debug.log
+/dist

benchmarks/README.md

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+These benchmark tests measure real usage of js-search.
+They enable simple performance comparisons between the latest released build and the local build.
+To run a benchmark:
+
+```bash
+cd /path/to/js-search
+yarn install
+
+# Build local js-search (to incorporate any changes you've made)
+npm run build
+
+cd ./benchmarks
+yarn install
+
+# Run a benchmark of your choice
+node ./regression-test.js
+```