Ignore Boost.Build build directory
Fix EOL
Replace .txt extension with .jsons
.jsons indicate the file stores number of JSON objects, one per line, versus .json with single possibly multiline object.
Update benchmark toolkit

Add benchmark() using default numbers of marks and iterations.
Record number of marks along number of iterations and parsings.
Pretty format timing output to stdout.
Control JSON dumping - useful to see if any JSON is actually parsed.
Add canada.json loader
Add benchmark runners for all supported libraries.

Update benchmark_spirit to unify with others
Add .bat script executing benchmark on Windows
Add scratchpad with results obtained on Windows

To be reformatted and moved to README.md
Update README.md

TODO: add results from the scratchpad