Improving cross-platform compatibility of webdriver-server C++ code.

This commit makes the common webdriver-server C++ code more easily
cross-platform. It does this mainly by removing use of std::tr1::regex,
which has issues compiling under gcc. In its place, we now use a custom
URL matching algorithm for matching URLs in the WebDriver JSON Wire
Protocol. While this matching algorithm may be a source of future errors,
a nice side effect of it is a 3% performance increase in server execution
times over using regular expressions.

Additionally, this commit includes an alias for snprintf, which throws
buffer overrun warnings when used with Visual Studio. It also contains
some header #include rearranging and linting of the C++ code.