Use std::unique_ptr correctly across compiler and language versions

Previously we only used it on GCC 6 to avoid deprecated declaration
warnings. Now we are proactive and use it whenever compiling as C++11
(or MSVC2010+).

It also moves the logic for deciding between unique_ptr and auto_ptr
into a single location in config.h.

This fixes some use cases that were previously broken, including:
* CXX=clang++ -std=c++11 -Werror=deprecated-declarations
* CXX=g++-6 -std=c++03 -Werror=deprecated-declarations

scoped_ptr has never been a part of the C++ standard - perhaps it's been
confused with boost::scoped_ptr. Anyhow, std::unique_ptr is the
replacement for the now-deprecated std::auto_ptr.

workaround for cuda 7.5 nvcc compiler

Fix JSONCPP_WITH_WARNING_AS_ERROR

in 0.y.z branch -Werror was always being added regardless of the
what JSONCPP_WITH_WARNING_AS_ERROR was set to. Additionally,
-std=c++11 was being set on Clang builds.

NORETURN for throw functions in 0.x.y branch

Added in definition also.

Resolve issue - https://github.com/open-source-parsers/jsoncpp/issues/389

Conflicts:
	src/test_lib_json/main.cpp

adding precision as settings value for StreamBuilder

Conflicts:
	src/lib_json/json_writer.cpp

For now use hardcoded precision '17' for now

Debian patches - 0.y.z branch

See #411.
  http://anonscm.debian.org/cgit/collab-maint/libjsoncpp.git/tree/debian/patches

Already applied to 0.y.x branch.

Merge pull request #339 from Dani-Hub/master

Floating-point NaN or Infinity values should be allowed as a feature …

Specify float constant as float

(I missed a couple. ~cd)

* Clean up closing statements for if conditions, functions, macros,
  and other entities. Newer versions of CMake do not require you to
  redundantly respecify the parameters to the opening arguments.

helps #325

This commit contains nothing but line ending normalization
changes. These changes were performed after the introduction
of .gitattributes into the repository.

Fixed by shifting a positive value, then negating the result.

(Credit: Richard Trieu)

-Werror shouldn't be used in released code since it can cause random build
failures on moderate warnings. It also depends on the used toolchain since
different toolchains may or may not print the same warnings.

undefined behavior.

resolves #272

Update json_tool.h

typo in a comment

Fix a typo in comment.