Updating javadocs for 2.40.0
Updating version numbers for impending 2.40 release
Updating java CHANGELOG for 2.40.0 release
Updating IE prebuilts for 2.40 release
Removing deprecated ChromeOptions.setExperimentalOptions
Removing deprecated FirefoxProfile.setProxyPreferences method.
Reducing the visibility of a deprecated class in the htmlunit driver.
Removing old version of selenium rc emulation and leaving the new one in place.
updating changelog / py docs and bumping version numbers for 2.40
Bump gem version to 2.40.0 + update rb/CHANGES
Updating .NET documentation build process
Updating .NET WebDriverBackedSelenium build process to account for moved files
Silencing .NET documentation build warnings. No functional changes.
Minor cleanup.
Fixing the java build