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.

Compile all examples with the Dinkum C++ of QNX 6.6

QCC -Wall -Wextra -Vgcc_ntoarmv7le -I../include <example>

GenericDocument: explicitly prohibit copying

See #201.

Minor (documentation) cleanups

Avoids implicit conversion from an `OutputStream` (or an allocator pointer)
to a `Writer` instance.

Use absolute path for the link to examples

Conflicts:
	include/rapidjson/internal/dtoa.h
	test/unittest/readertest.cpp

Allow customization of RapidJSON namespace