fixed execve command, now supporting pyenv

gui.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python3.5
+#!/usr/bin/env python3.5
 # Copyright 2017 Digital
 #
 # This file is part of BeeWatch.

lib/beewatch/__init__.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python3.5
+#!/usr/bin/env python3.5
 # Copyright 2017 Digital
 #
 # This file is part of BeeWatch.

lib/beewatch/gui/__init__.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python3.5
+#!/usr/bin/env python3.5
 # Copyright 2017 Digital
 #
 # This file is part of BeeWatch.

lib/beewatch/pinapi/__init__.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python3.5
+#!/usr/bin/env python3.5
 # Copyright 2017 Digital
 #
 # This file is part of BeeWatch.

server.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3.5
+#!/usr/bin/env python3.5
 # Copyright 2017 Digital
 #
 # This file is part of BeeWatch.