Data files used in benchmarks updated

The data files used in the benchmarks have been updated to include
numbers and booleans.
Optimizations + JsonNavigator

The JsonTokenizer, JsonParser and JsonParser2 have been optimized
further. A JsonNavigator has been added which can be used to navigate
the indices produced by JsonParser and JsonParser2 + extract data from
the data buffer.
JsonNavigator added

The JsonNavigator was missing in the previous commit.
JsonNavigator unit tests added
Benchmark code added
Benchmark .cmd files added

Scripts for running the benchmarks on Windows.
Unused classes removed