fix issue #444

Introduce comments support

* Comments parsing function correctly handles EOF.
* Since SkipWhitespaceAndComments can generate errors, its calls should be followed by RAPIDJSON_PARSE_ERROR_EARLY_RETURN macro.
* Some tests to make the bug never appear again.

Keep Document value unchanged on parse error, fixes #437

Keeping the DOM unchanged in case of an error is the intended
behaviour according to the [documentation] [1].

Instead of forcing the value to `kNullType` before starting the
parsing, store the parsed value upon success via regular move.

[1]: https://miloyip.github.io/rapidjson/md_doc_dom.html#ParseError

Fix UB in GenericDocument::ParseStream

To check is it possible to expose allocator.

check return of fwrite to avoid warn_unused_result build failures. Fixed #420. Thank you.

Fix incorrect 64-bit alignment

Added unit tests for alignment macros.
Fixes #418

BigInteger: guard against self-assignment

Related-to: #404.
Suggested-by: @cosinekitty

doc: 自定义流应当使用 ParseStream 而不是 Parse

added missing fields of CMakeList.txt

this fixed cmake error for me

Implement = operator for BigInteger

There's a copy constructor, but no '=' operator implemented. This is dangerous.

Fix include location

@PlatformIO Library Registry manifest file

* This library in Web Registry: http://platformio.org/#!/lib/show/438/RapidJSON
* Specification: [PlatformIO Library Manager](http://docs.platformio.org/en/latest/librarymanager/index.html)
* Integration: [IDE Integration](http://docs.platformio.org/en/latest/ide.html)

Fix the error when compiled using vs2013

The error message for the original codes is: unary minus operator applied to unsigned type, result still unsigned. Added static casting to eliminate this message.

Warning cleanup on osx10.10/clang, enable -Werror

This reverts commit 5be9b6e5.

Clarify problematic JSON license (#377)

Prohibit C++11 move from Document to Value