Merge Support PlatformIO (PR#34)

**** NOTE ****
This code is very EXPERIMENTAL and UNSUPPORTED

PlatformIOAddons/.gitignore

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+.pioenvs
+*.dblite

PlatformIOAddons/Readme.md

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+This folder contains the project file to build and install Marlin firmware using the PlatformIO development environment.
+
+1) Install platformio (See http://platformio.org/)
+
+....
+
+x) From this directory
+  platformio run
+

PlatformIOAddons/generate_version_header_for_marlin

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+#/usr/bin/env python -
+from SCons.Script import DefaultEnvironment
+
+env = DefaultEnvironment()
+
+import os
+import errno
+
+def make_sure_path_exists(path):
+    try:
+        os.makedirs(path)
+    except OSError as exception:
+        if exception.errno != errno.EEXIST:
+            raise
+
+import subprocess
+
+make_sure_path_exists(env.subst('$BUILDSRC_DIR'))
+
+from datetime import datetime
+import time
+import string
+import re
+
+p = subprocess.Popen(['git', 'symbolic-ref', '-q', '--short', 'HEAD'], stdout=subprocess.PIPE)
+BRANCH = p.stdout.readline().rstrip()
+p = subprocess.Popen(['git', 'describe', '--tags', '--first-parent'], stdout=subprocess.PIPE)
+RAW_VERSION = p.stdout.readline().rstrip()
+s = re.search('(.*)(-.*)(-.*)',RAW_VERSION)
+SHORT_VERSION = s.group(1)+' '+BRANCH
+DETAILED_VERSION = string.replace(RAW_VERSION,'-',' '+BRANCH+'-',1)
+p = subprocess.Popen(['git', 'config', '--local', '--get', 'remote.origin.url'], stdout=subprocess.PIPE)
+
+
+try:
+  s = re.search('(.*github.com:)(.*)', p.stdout.readline().rstrip())
+  URL = string.replace("https://github.com/"+s.group(2), ".git", "/")
+
+  url_text = """#define SOURCE_CODE_URL  "%s"
+// Deprecated URL definition
+#define FIRMWARE_URL  "%s"
+""" % (URL, URL)
+except Exception, e:
+  url_text = ""
+
+version_header_text = """/* This file is automatically generated by a compile time hook
+ * Do not manually edit it
+ * It does not get committed to the repository
+ */
+
+#define BUILD_UNIX_DATETIME %s
+#define STRING_DISTRIBUTION_DATE "%s"
+#define SHORT_BUILD_VERSION "%s"
+#define DETAILED_BUILD_VERSION "%s"
+%s""" % (int(time.time()), datetime.now().strftime('%Y-%m-%d %H:%M'),SHORT_VERSION, DETAILED_VERSION, url_text)
+
+open(env.subst('$BUILDSRC_DIR/_Version.h'), 'w').write(version_header_text)

PlatformIOAddons/platformio.ini

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+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[platformio]
+src_dir = ../Marlin
+
+[env:mega2560]
+platform = atmelavr
+framework = arduino
+board = megaatmega2560
+extra_script = ./generate_version_header_for_marlin
+build_flags = -D USE_AUTOMATIC_VERSIONING -I $BUILDSRC_DIR
+board_f_cpu = 16000000L
+
+[env:mega1280]
+platform = atmelavr
+framework = arduino
+board = megaatmega1280
+extra_script = ./generate_version_header_for_marlin
+build_flags = -D USE_AUTOMATIC_VERSIONING -I $BUILDSRC_DIR
+board_f_cpu = 16000000L
+
+[env:printrboard]
+platform = teensy
+framework = arduino
+board = teensy20pp
+extra_script = ./generate_version_header_for_marlin
+build_flags = -D USE_AUTOMATIC_VERSIONING -I $BUILDSRC_DIR -D MOTHERBOARD=BOARD_PRINTRBOARD
+# Bug in arduino framework does not allow boards running at 20Mhz
+#board_f_cpu = 20000000L
+
+[env:brainwavepro]
+platform = teensy
+framework = arduino
+board = teensy20pp
+extra_script = ./generate_version_header_for_marlin
+build_flags = -D USE_AUTOMATIC_VERSIONING -I $BUILDSRC_DIR -D MOTHERBOARD=BOARD_BRAINWAVE_PRO -D AT90USBxx_TEENSYPP_ASSIGNMENTS