Restest

- ADD: new `EMPTY` value check mode

- ADD: new `content` attribute on requests

- ADD: postman output support
- FIX: body decoding error

- ADD: support for `files` array to post files in requests
- ADD: new internal method \_resolve_fname() to support file name resolution

- ADD: support for new `no_cookies` param
- ADD: support for `max_time` to check if a request takes too long
- ADD: request time is shown in the output log
- ADD: request time is shown in the console output
- ADD: support for `PUT`, `DELETE` and `PATCH` requests
- ENH: code cleanup

- ADD: more documentation
- FIX: a bug in the "forced log"