- start with validator functionality
- front end changes (preparation for validator functionality)
- validation of HTML at URL added
- preparation for validation by file and direct input
- refactored entities inheritance

- need to consider how to connect validation with elements checking in case of file upload and direct input operating mode
- app can be used by multiple users now
- readme update
- mailto type of links support added
- front end CSS updates
Merge pull request #2 from Ekimik/validator-dev

Validator dev