Coding style guide

For the most part we follow the Google C++ style guide http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml. The exceptions are:

We prefix getters with get_ for clarification. We use "string" as the type where we would otherwise say "std::string". A global define in kml/base/util.h declares "using std::string". This permits direct use of libkml in codebases that have their own (STL-compatible) string implementation. For the same reason we don't #include everywhere string is used.