Mac osx not yet tested in CI

Platforms.md

@@ -1,9 +1,20 @@
-We use **cmake**, so a wide-variety of platforms *might* be supported.
+# Wide support
+We use **cmake**, so a wide-variety of platforms *might* be supported. We expect the following to work fine:
 
+- **linux**, 32- and 64-bit varieties, using both **gcc** and **clang**, several versions
+- **Windows**, 32- and 64-bit, under Visual Studio, several versions, including 2013
+- **Mac OSX**, using both **gcc** and **clang**
+
+If you find a problem with a specific machine or compiler, please submit a GitHub issue.
+
+## C++ version
+Different branches of our code expect different versions of C++. Travis/Appveyor simply runs the latest C++ compiler possible, and our own `#ifdef` macros handle the differences. The `master` branch expects **C++11**. The `0.y.z` branch can use something earlier than even C++0x; for the benefit of Android, it does not even require C++11 *libraries*. (Hopefully we can relax that constraint someday.)
+
+# Continuous Integration (building and testing)
 ## Travis CI
 We run builds and tests in Travis for
 - **linux**
-- Mac **osx** (*coming soon*!)
+- Mac **osx** ([*coming soon*!](https://github.com/open-source-parsers/jsoncpp/pull/250))
 
 For *each* os, we try both:
 - **gcc**
@@ -20,6 +31,3 @@ See [Appveyor docs](http://www.appveyor.com/docs/installed-software) for exact v
 
 ## Others
 Lots of older compilers and other platform variants might work too. If you find something broken, please let us know.
-
-## C++ version
-Different branches of our code expect different versions of C++. Travis/Appveyor simple runs the latest C++ compiler possible, and our own `#ifdef` macros handle the differences. The `master` branch expects **C++11**. The `0.y.z` branch can use something earlier than even C++0x; for the benefit of Android, it does not even require C++11 *libraries*. (Hopefully we can relax that constraint someday.)