Fixes BOM marker with setup.bat on Windows (#2108)

Currently, the Out-File PowerShell Cmdlet breaks config.ini by turning it into a Little Endian UTF-16 file, in turn breaking the script.
Replaced the Out-File Cmdlet with a python in-line replace of a file (I mean, we already have python, so why not make full use of it...?)

Easy Setup/setup.bat

@@ -39,9 +39,8 @@ cd ..
 "%PATH2%\Scripts\pip" install -r requirements.txt
 "%PATH2%\Scripts\pip" install -r requirements.txt --upgrade
 cd config
-copy config.ini.example config.ini
 set /p API= Enter your Google API key here:
-powershell -Command "(gc config.ini) -replace '#gmaps-key:', 'gmaps-key: %API%' | Out-File config.ini"
+"%PATH2%\python" -c "print open('config.ini.example').read().replace('#gmaps-key:','gmaps-key:%API%')" > config.ini
 
 echo All done!
 pause