Serpscrap

* fixed related keywords selector serps
* added results_age, to specify the age of serp results
* updated selenium/chromium versions

* updated dependencies: chromedriver >= 76.0.3809.68 to use actual driver, sqlalchemy>=1.3.7 to solve security issues and other minor update changes
* minor changes install_chrome.sh

* update and cleanup of selectors to fetch results
* new resulttype videos

* Chrome headless is now the default browser, usage of phantomJS is deprecated
* chromedriver is installed on the first run (tested on Linux and Windows. Mac OS should also work)
* behavior of scraping raw text contents from serp urls, and of course given urls, has changed
* run scraping of serp results and contents at once
* csv output format changed, now it's tab separated and quoted

* fixed as_csv 38
* removed requirements.txt

* updated dependencies
* screenshots are working again
* customizable number of reults per page 30