Add basic tasking support for environment variables

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@291 42af7a65-404d-4744-a932-0658087f49c3

Documentation/NuttX.html

@@ -619,7 +619,10 @@ Other memory:
 	* fs/fs_opendir.c: Correct errors in semaphore usage that can cause deadlock.
 	* lib/lib_getopt.c: Added getopt() support
 	* examples/nsh:  NSH now supports cat, mount, umount, and mkdir.  ls supports
-          -l -s, and -R
+	  -l -s, and -R
+	* Added basic OS support to manage environment variables:  environment
+	  storage, cloning on task creation, sharing on pthread creation, destruction
+	  on thread/task exit.
 	* Started m68322
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