Because of a typo in test/testprogs/Makefile.am, the tests for object
were never compiled or run.

It doesn't have to be in version control.

These were left out from the previous commit.

Linux on powerpc seems to be one such platform.

From 2.63 to 2.59, which is more widely supported.

Backported from master, commit 5406c2b3:
  * deleted test/testdata/invalid-stripped because the stripped tests
    don't exist in 1.0

Backported from master, commit 9d16ec75

In stream_get(), EOF never got it to stream->buffer and because of
this, stream_unget() failed on some situations. This patch makes
stream_get() handle EOF just like any other byte.

As a "side effect", lex_scan_string() now needs to unget the EOF, or
otherwise it ends up in error message on premature end of input.

json_is_true was spelled jsin_is_true. Quite fatal.

This way it's an individual subdirectory and things go easier.

- Tests are now named
- Testlogs are preserved between runs
- Tests can be run through Valgrind Memcheck tool

Before, only the syntax level (parse_*) was able to set the error
string. This patch fixes the situation so that lexical (lex_*) and
stream (stream_*) levels can report detailed error messages.

Also, instead of 0, EOF is now returned by stream on error.

Object sorting will be implemented later.

All strings (decoded JSON text, the argument of json_string(), the key
argument of json_object_set()) are checked for valid UTF-8.