Fix creating the nuget package with Raggles' fork of CoApp

Token-by-token pull parsing

Missing "internal" namespace for StrLen

include/rapidjson/pointer.h:243:40: error: 'StrLen' was not declared in this scope
         return Append(name, StrLen(name), allocator);

NaN/Inf parse fix

A failed half-consume of “NaN” now returns “value invalid” instead of
attempting to consume an “Inf”.

Noticed that the reader could over-consume “NaN” if token terminated in
the middle.

Add more tests! Good for coverage.

Runs about 1-2% faster (original speed) by running in a tight loop, at
the expense of slight code duplication with IterativeParseNext.

Improved reporting

std::to_string can’t be used because it requires C++11.

Example code to demonstrate how the token-pulling reader can be used.

Doesn’t seem to affect timings in perftest on my machine, but it may
help others.

New unit test which ensures that IterativeParseNext always generates
exactly one element at a time, and that calling IterativeParseNext on a
complete document is harmless and generates zero events.

Further improvement to perftest and hoping to make coveralls happy.

Slight performance improvement over previous submission

Refactored the iterative parser so that users can parse a single JSON
element at a time (invoking the handler one time) and then return
control to the calling code. Call IterativeParseInit to start, and then
call IterativeParseNext to retrieve one JSON element. Use
IterativeParseComplete to check for JSON document completion.

Add “filename” to the error message when JsonChecker reports an error.

Fix #824

Treat signed-unsigned conversions as errors.

Change internals from English to Chinese

Translate doc/internals.md into Chinese

added assertion to help suppress clang warnings

Improved customization of RAPIDJSON_NEW macro