More elaborate .bat files, requirements.txt

The updated bat files should allow to start Red in case of no python in PATH (assuming standard installation path) and have multiple python installations without issues

requirements.txt

@@ -0,0 +1,3 @@
+git+git://github.com/Rapptz/discord.py.git#egg=discord.py[voice]
+youtube_dl
+imgurpython

startRed.bat

@@ -1,4 +1,35 @@
+@echo off
 chcp 65001
+echo.
 pushd %~dp0
-python red.py
+
-pause
+::Attempts to start py launcher without relying on PATH
+%SYSTEMROOT%\py.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO attempt
+%SYSTEMROOT%\py.exe -3.5 red.py
+PAUSE
+GOTO end
+
+::Attempts to start py launcher by relying on PATH
+:attempt
+py.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO lastattempt
+py.exe -3.5 red.py
+PAUSE
+GOTO end
+
+::As a last resort, attempts to start whatever Python there is
+:lastattempt
+python.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO message
+python.exe red.py
+PAUSE
+GOTO end
+
+:message
+echo Couldn't find a valid Python 3.5 installation. Python needs to be installed and available in the PATH environment 
+echo variable. 
+echo https://twentysix26.github.io/Red-Docs/red_win_requirements/#software
+PAUSE
+
+:end

startRedLoop.bat

@@ -1,9 +1,37 @@
-@Echo off
+@echo off
 chcp 65001
+echo.
 pushd %~dp0
-:Start
 
-python red.py
+:loopstart
+
+::Attempts to start py launcher without relying on PATH
+%SYSTEMROOT%\py.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO attempt
+%SYSTEMROOT%\py.exe -3.5 red.py
 timeout 3
+GOTO loopstart
 
-goto Start
+::Attempts to start py launcher by relying on PATH
+:attempt
+py.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO lastattempt
+py.exe -3.5 red.py
+timeout 3
+GOTO loopstart
+
+::As a last resort, attempts to start whatever Python there is
+:lastattempt
+python.exe --version > NUL 2>&1
+IF %ERRORLEVEL% NEQ 0 GOTO message
+python.exe red.py
+timeout 3
+GOTO loopstart
+
+:message
+echo Couldn't find a valid Python 3.5 installation. Python needs to be installed and available in the PATH environment 
+echo variable. 
+echo https://twentysix26.github.io/Red-Docs/red_win_requirements/#software
+PAUSE
+
+:end