Reorganized some features. Try to make the text clearer in features and
tutorial.

Add std::string overload to Writer when RAPIDJSON_HAS_STDSTRING defined

Use aligned SSE register load intrinsic.

The code goes to the trouble of ensuring that data is aligned at a
16-byte boundary, then goes ahead and uses the unaligned form of the
load intrinsic _mm_loadu_si128.

Either the code shouldn't bother aligning the data to the start of the
whitespace, or it should use the aligned form of the intrinsic.

Correct Value(kStringType) and more assertions

Reader::Parse{Array,Object}: simplify switch

Closes #223.

Fix an issue with building a reader on Windows x64. 

Fix an issue with Windows x64. Including the rapidjson reader.h requires <intrin.h> to be included or _umul128 will be undefined.

stringbuffer.h: add missing include for std::move (fixes #208)

Parse JSON number to double in full-precision with custom strtod. Fix #120

Add move constructor and prohibit copy constructor and assignment
operator.

https://github.com/miloyip/rapidjson/issues/120#issuecomment-54428797

GenericValue: improve copying performance

The GenericValue "copy" constructor (with Allocator) uses a temporary
GenericDocument object to perform the deep copying with the provided
allocator.  This leads to the temporary allocation of the `Stack`
memory, even in case of shallow values (numbers, etc.).

This patch improves the performance of this operation by only resorting
the the SAX Handler implementation in case of Array or Object values.