Merge branch 'release/v2.8.4' into develop

HISTORY.rst

@@ -4,7 +4,7 @@ Release Notes
 PlatformIO 2.0
 --------------
 
-2.8.4 (2016-02-??)
+2.8.4 (2016-02-17)
 ~~~~~~~~~~~~~~~~~~
 
 * Added support for the new ESP8266-based boards (ESPDuino, ESP-WROOM-02,

platformio/__init__.py

@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (2, 8, "4.dev1")
+VERSION = (2, 8, 4)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"