Allow examples and test-suite to be built out of source tree

- Examples/Makefile.in rules use SRCDIR as the relative source directory

- ./config.status replicates Examples/ source directory tree in build
  directory, and copies each Makefile to build directory, prefixed with
  a header which sets SRCDIR to source directory

- Examples/test-suite/.../Makefile.in set SRCDIR from Autoconf-set srcdir

- Examples/test-suite/errors/Makefile.in needs to filter out source
  directory from SWIG error messages

- Lua: embedded interpreters are passed location of run-time test

- Python: copy run-time scripts to build directory because of 2to3
  conversion; import_packages example copies __init__.py from source
  directory; test-suite sets SCRIPTDIR to location of run-time tests

- Javascript: binding.gyp renamed to binding.gyp.in so that $srcdir
  can be substituted with SRCDIR; removed './' from require() statements
  so that NODE_PATH can be used to point Node.js to build directory

Examples/javascript/exception/binding.gyp.in

@@ -0,0 +1,30 @@
+{
+  "targets": [
+    {
+      "target_name": "example",
+      "sources": [ "$srcdir/example.cxx", "example_wrap.cxx" ],
+      "include_dirs": ["$srcdir"],
+      'defines': [
+        'BUILDING_NODE_EXTENSION=1',
+      ],
+      'conditions': [
+        ['OS=="mac"',
+          {
+            'xcode_settings': {
+              'GCC_ENABLE_CPP_RTTI': 'YES',
+              'GCC_ENABLE_CPP_EXCEPTIONS' : 'YES'
+            }
+          }
+        ],
+        ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"',
+          {
+            'cflags': [ "-Wno-unused-variable", "-Wno-unused-but-set-variable", "-Wno-unused-but-set-parameter"],
+            'cflags_cc': [ "-Wno-unused-variable", "-Wno-unused-but-set-variable", "-Wno-unused-but-set-parameter"],
+            'cflags!': [ '-fno-exceptions' ],
+            'cflags_cc!': [ '-fno-exceptions', '-fno-rtti' ]
+          }
+        ]
+      ]
+    }
+  ]
+}