Added a percentage completion counter to scraper.py which is entirely based on the one found in mozgression/utils.py
Adjustments to the display. Added an active progressbar and bytes downloaded in numbers
Fixed length and left-alignment of download progressbar
Implemented download rate and estimated finishing time
Implemented a CLI progressbar with download rate and eta. Addressed all the nitpicks noted in the previous commit
Made the pull request pep8 compliant
adjusted spacing and addressed various nitpicks
Added trailing whitespace to string in line 180 to avoid double seconds sign