Merge branch 'release/v3.4.0' into develop

HISTORY.rst

@@ -4,7 +4,7 @@ Release Notes
 PlatformIO 3.0
 --------------
 
-3.4.0 (2017-??-??)
+3.4.0 (2017-06-26)
 ~~~~~~~~~~~~~~~~~~
 
 * `PIO Unified Debugger <http://docs.platformio.org/page/plus/debugging.html>`__

platformio/__init__.py

@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (3, 4, "0rc1")
+VERSION = (3, 4, 0)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"