adding back old method of doing http requests for non keep-alive connections

(I tried setting Connection:'close' that *should* work, but ghostdriver wasn't honoring it and didn't respond with the right header)

Fixes Issue #6707 #6706
some py3 compatibility
ok, now py3 support ;)
python 2.38.4
Set the content type in proxy settings test.

Without this, the htmlunit driver believes we've returned a page of text,
and then can't find elements.
Bump the version of littleproxy to an actually release.
Ignoring failing htmlunit tests
Fixing Window sizing tests for Firefox 26 on Windows.

Starting with Firefox 26, the minimum width of the window is ~405 pixels.
The tests attempted to set the window width to 275 pixels, which would not
succeed. We now use 450 pixels as the width to set to.
Adding experimental IWebDriver extension methods to .NET support classes

This commit adds extension methods to IWebDriver, which can be used to
reduce the amount of type casting that must be done to access
functionality not provided by the base IWebDriver interface. The following
methods were added:

 * TakeScreenshot() - does not require a cast to ITakesScreenshot, and has
   support for working directly with instances of RemoteWebDriver.
 * ExecuteJavaScript<T>() - does not require a cast to
   IJavaScriptExecutor, and will automatically cast the result to the type
   specified by the generic type parameter (T).

These extension methods should be considered experimental. To use them
requires a reference to WebDriver.Support.dll, and adding a using clause
for OpenQA.Selenium.Support.Extensions.
FxCop and StyleCop fixes. No functional changes.
Deleting dead files
Preventing dir creation failure if the output dir already exists (RC). Fixes issue 6704
Preventing NPE while creating a dir for the result file (RC). Fixes issue 6695
Don't require rake when loading selenium-client. Fixes issue 6709.
Updating IE prebuilts for impending 2.39 release
Updating version numbers for 2.39.0 release
Updating Java CHANGELOG for 2.39
Updating .NET CHANGELOG for 2.39.0 release
Updating java docs for 2.39.0
Bump webdriverjs to 2.39.0