Update examples, pytest version, and console scripts

• Update examples
• Use pytest >= 4.6.5 on Python 2 (Python 3 uses pytest >= 5.0.1)
• Update console scripts test generator

Add the "sb" pytest fixture

• Add the "sb" pytest fixture

Usage examples:

# "sb" pytest fixture test in a method with no class
def test_sb_fixture_with_no_class(sb):
    sb.open("https://google.com/ncr")
    sb.update_text('input[title="Search"]', 'SeleniumBase\n')
    sb.click('a[href*="github.com/seleniumbase/SeleniumBase"]')
    sb.click('a[title="seleniumbase"]')


# "sb" pytest fixture test in a method inside a class
class Test_SB_Fixture():
    def test_sb_fixture_inside_class(self, sb):
        sb.open("https://google.com/ncr")
        sb.update_text('input[title="Search"]', 'SeleniumBase\n')
        sb.click('a[href*="github.com/seleniumbase/SeleniumBase"]')
        sb.click('a[title="examples"]')

Adding w3c Chromedriver support

• Adding w3c ChromeDriver support.
• Better error handling for scrolling actions.
• seleniumbase install chromedriver now installs ChromeDriver version 2.44 by default.

Use a customized virtual display in headless mode

Use a customized virtual display in headless mode

• This removes the pyvirtualdisplay requirement
• This also makes tests run much faster in headless mode

Update pyotp lib and seleniumbase mkdir command

Update pyotp lib and seleniumbase mkdir command

• Update pyotp to >=2.3.0
• Have the seleniumbase mkdir script create an extra example test.

New option: Set initial URL with --start_page=URL or --url=URL

Add ability to set initial URL with --start_page=URL or --url=URL cmd option

Make --headless mode the default setting on Linux

Make --headless mode the default setting on Linux

Improve the export feature for website tours

Improve the export feature for website tours

Optimize selector detection and usage

Optimize selector detection and usage

Small updates to reliability and logging

Small updates to reliability and logging

• Update demo-mode reliability
• Update logging level for "requests" and "urllib3"