Updated macOS scripts to be commands, makes them easier to run.

package.sh

@@ -154,6 +154,7 @@ if [ $BUILD_TARGET = "win32" ]; then
     cp -a scripts/${BUILD_TARGET}/*.bat $TARGET_DIR/
 else
     cp -a scripts/${BUILD_TARGET}/*.sh $TARGET_DIR/
+    cp -a scripts/${BUILD_TARGET}/*.command $TARGET_DIR/
 fi
 
 #package the result

scripts/osx64/cura.command

@@ -1,20 +1,27 @@
 #!/bin/bash
 
-python -c 'import OpenGL'
+python2.7 -c ''
+if [ $? != 0 ]; then
+	echo "Requires python2.7"
+	echo " Install python2.7"
+	exit 1
+fi
+
+python2.7 -c 'import OpenGL'
 if [ $? != 0 ]; then
 	echo "Requires PyOpenGL"
 	echo " sudo easy_install PyOpenGL"
 	exit 1
 fi
 
-python -c 'import wx'
+python2.7 -c 'import wx'
 if [ $? != 0 ]; then
 	echo "Requires wx. Download and install (the Cocoa/64-bit variant) from:"
 	echo " http://www.wxpython.org/download.php"
 	exit 1
 fi
 
-python -c 'import serial'
+python2.7 -c 'import serial'
 if [ $? != 0 ]; then
 	echo "Requires pyserial."
 	echo " sudo easy_install pyserial"