Merge features from dev to master

Features:

• Added option for a parameter file. By default the scraper looks for a file called parameters.txt in the directory it is being run. If it finds it, it will read and apply any parameters described there. Check the Readme for more info.
• Added usage hints to highlight some features after running the scraper. If you don't want to see them, use the parameter --disable-hints. You can also put it in parameters.txt ;)
• If you dislike progress bars you can now hide it using --no-progress-bar

Changes:

• Size of progress bar now depends on your terminal window size.