Merge branch 'develop' into feature/platformio-30

* develop:
  Version bump to 2.9.2 (issues #641, #645, #648, #652, #664, #665, #666, #671, #674)
  Fix issue with ARM mbed framework when abstract class breaks compile for LPC1768 // Resolve #666
  Fix issue with ARM mbed framework and multiple definition errors   on FRDM-KL46Z board // Resolve #641
  List embedded boards in docs
  Fix multiple definition in mbed framework when using abstract class // Issue #641, #666
  Add "stlink" as the default uploader for STM32 Discovery boards // Resolve #665
  Implement grep serial ports for Windows
  Remove unused imports
  Minor improvements
  Fix PyLint's "misplaced-comparison-constant"
  Use $PROGNAME instead static name when looking for the firmware
  Update title of the article
  Add new articles
  Link Community Forums FAQ with Docs FAQ
  Grep for "/dev/cu.*" on OS X
  Skip grep search for serial ports on Windows machines
  Improve firmware uploading to Arduino Leonardo based boards
  Add MinGW to the PATH

# Conflicts:
#	docs/index.rst
#	docs/platforms/creating_board.rst
#	docs/projectconf.rst
#	docs/userguide/platforms/cmd_install.rst
#	platformio/__init__.py
#	platformio/builder/scripts/atmelavr.py
#	platformio/builder/scripts/atmelsam.py
#	platformio/builder/scripts/frameworks/mbed.py

platformio/util.py

@@ -287,7 +287,34 @@ def exec_command(*args, **kwargs):
     return result
 
 
-def get_serialports():
+def get_serialports(use_grep=False):
+
+    def _grep_serial_ports():
+        result = []
+        if system() == "Windows":
+            output = exec_command(["mode"]).get("out", "")
+            for line in output.split("\n"):
+                line = line.strip()
+                if "COM" in line:
+                    result.append({"port": line[line.index("COM"):-1],
+                                   "description": "", "hwid": ""})
+        else:
+            if system() == "Linux":
+                patterns = ["/dev/%s*" % p for p in (
+                    "ttyS", "ttyUSB", "ttyACM", "ttyAMA", "rfcomm", "ttyO")]
+            else:
+                patterns = ["/dev/tty.*", "/dev/cu.*"]
+            for pattern in patterns:
+                for port in glob(pattern):
+                    result.append(
+                        {"port": port, "description": "", "hwid": ""})
+        return result
+
+    if use_grep:
+        result = _grep_serial_ports()
+        if result:
+            return result
+
     try:
         from serial.tools.list_ports import comports
     except ImportError:
@@ -297,7 +324,7 @@ def get_serialports():
     for p, d, h in comports():
         if not p:
             continue
-        if "windows" in get_systype():
+        if system() == "Windows":
             try:
                 d = unicode(d, errors="ignore")
             except TypeError:
@@ -305,9 +332,9 @@ def get_serialports():
         result.append({"port": p, "description": d, "hwid": h})
 
     # fix for PySerial
-    if not result and system() == "Darwin":
-        for p in glob("/dev/tty.*"):
-            result.append({"port": p, "description": "", "hwid": ""})
+    if not result and not use_grep:
+        result = _grep_serial_ports()
+
     return result
 
 
@@ -315,7 +342,7 @@ def get_logicaldisks():
     disks = []
     if system() == "Windows":
         result = exec_command(
-            ["wmic", "logicaldisk", "get", "name,VolumeName"]).get("out")
+            ["wmic", "logicaldisk", "get", "name,VolumeName"]).get("out", "")
         disknamere = re.compile(r"^([A-Z]{1}\:)\s*(\S+)?")
         for line in result.split("\n"):
             match = disknamere.match(line.strip())