Other features to add

[kalwalt]

I think this features need to be added in a near future:

• [x] jsfeat_fast_corners
• [x] jsfeat_transform
• [ ] support for S_64 format (BigInt64Array)
• [x] improved type checking args.
• [x] a code formatting tool ( prettier?)
• [ ] simple testing tool
• [ ] documentation in the code and external documentation (wiki or other...)

I think jsfeat_haar and jsfeat_bbf can be added later.

[kalwalt]

I tthink i can add quickly jsfeat_transform there are few methods inside and one is a duplicated: https://github.com/inspirit/jsfeat/blob/4c7b336bbeeb26e6cd4cdf3c7d414abe273846f3/src/jsfeat_transform.js#L18 is already inthe math class.