Update webdriver installation script

Update webdriver installation script:

• seleniumbase install chromedriver will now install chromedriver v2.46, except on Linux machines, which may be using older versions of Chrome
• seleniumbase install geckodriver will now install v0.24.0 (for Firefox)
• seleniumbase install operadriver will now install v.2.40

Other changes:

• Update starting browser dimensions

Update requirements

Update requirements:

• Update pytest to v4.3.0

Clone an existing method with an additional name

Clone an existing method with an additional name:

• Add self.assert_element_visible(CSS_SELECTOR), which does the same thing as self.assert_element(CSS_SELECTOR).

Adding exact text methods and other improvements

Adding exact text methods and other improvements:

• Add self.assert_exact_text()
• Add self.wait_for_exact_text_visible()
• Update pytest version to 4.2.1
• Adding more reliability to some methods
• Fix a bug with text assertion

Fix Python 2 compatibility

Fix Python 2 compatibility:

• Use more-itertools version >=5.0.0,<6.0.0

Update parameterized version

Update parameterized version:

• Set parameterized>=0.7.0

Update examples

Mostly updating example tests to use a non-camelCase format for assertions.

• self.assert_true() can now be used in place of self.assertTrue()
• self.assert_equal() can now be used in place of self.assertEqual()

Save the URL with exported SeleniumBase tours

Tour update:

• Save the URL with exported SeleniumBase JavaScript tours

Refactoring and new methods

Refactoring and new methods:

• Git-ignore the .vscode folder
• flake8 upgraded to v3.7.4
• Simplify BeautifulSoup usage
• Remove old deprecated methods
• Deprecate scroll_click() because click() already scrolls
• Add methods to avoid using camelCase in Python

Update pytest requirements and a few other things

Update pytest requirements and a few other things:

• Updated requirements: pytest>=4.2.0, pytest-xdist>=1.26.1, flake8==3.7.3.
• Add option to raise a Python Exception immediately when specifying an invalid proxy string, rather than waiting to display a warning message at the end of the test run (without using a proxy server). Usage: --proxy=[PROXY_STRING].
• Disable Chrome local_discovery pop-up notifications, such as "New printer on your network".