- Release date: 2016-07-31

- SHA-256: 8e97b7965b4594b00998d6704465412360e1a0ed927badb51ded8b82291a8f3d

This release combines a lot of small fixes and improvements. The release is backwards compatible.

- The **parser** has been overworked, and a lot of small issues have been fixed:
  - Improved parser performance by avoiding recursion and using move semantics for the return value.
  - Unescaped control charaters `\x10`-`\x1f` are not accepted any more.
  - Fixed a bug in the parser when reading from an input stream.
  - Improved test case coverage for UTF-8 parsing: now, all valid Unicode code points are tested both escaped and unescaped.
  - The precision of output streams is now preserved by the parser.
- Started to check the **code correctness** by proving termination of important loops. Furthermore, individual assertions have been replaced by a more systematic function which checks the class invariants. Note that assertions should be switched off in production by defining the preprocessor macro `NDEBUG`, see the [documentation of `assert`](http://en.cppreference.com/w/cpp/error/assert).
- A lot of **code cleanup**: removed unused headers, fixed some compiler warnings, and fixed a build error for Windows-based Clang builds.
- Added some compile-time checks:
  - Unsupported compilers are rejected during compilation with an `#error` command.
  - Static assertion prohibits code with incompatible pointer types used in `get_ptr()`.
- Improved the [documentation](https://nlohmann.github.io/json/), and adjusted the documentation script to choose the correct version of `sed`.
- Replaced a lot of "raw loops" by STL functions like `std::all_of`, `std::for_each`, or `std::accumulate`. This facilitates reasoning about termination of loops and sometimes allowed to simplify functions to a single return statement.
- Implemented a `value()` function for JSON pointers (similar to `at` function).
- The Homebrew formula (see [Integration](https://github.com/nlohmann/json#integration)) is now tested for all Xcode builds (6.1 - 8.x) with Travis.
- Avoided output to `std::cout` in the test cases.