Can wait even if file/url scan is in progress (#8)

* added waiting for files/urls that are already in scan

* hash search refactoring

Hash search enhancements (#7)

* typo fix

* Bug fixes. Thanks to A. Gurin for bugreporting

* gofmt -s -w

* fixed compatibility with go-latest

* print json even result is non-positive

Merge pull request #2 from moldabekov/dev

JSON support

Merge pull request #1 from moldabekov/dev

Production release