For the latest info here and for discussion please visit https://github.com/sayedihashimi/slow-cheetah/issues/158.
I first developed SlowCheetah around VS2010 SP2 with the idea that I could at some point transition this to the appropriate team(s) at Microsoft. Unfortunately I haven't been able to do that, and the existence of this extension has actually worked against that goal.
I'm really happy that SlowCheetah has gotten the attention and success that it has, but now it's time for me to move on.
No support for SlowCheetah in VS "14"
I am not planning to update SlowCheetah for Visual Studio "14". If you would like to see support for transforms in VS "14" I suggest you vote, and comment, on the uesrvoice item at http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/2043217-support-web-config-style-transforms-on-any-file-in.
No new features
I will not be adding any features to SlowCheetah myself. If anyone want's to add any features I will try and help guide anyone who is interested.
No fixes for regressions
If there are any scenarios that work in VS2013 RTM that do not work in future version of Visual Studio then I will not be fixing them.
I hope you all understand my situation here. I have spent countless hours working on SlowCheetah and there is very little ROI for me so, I need to move on to focus on other OSS projects that I'm involved in.
Thanks for all the love. I still love SlowCheetah too and I'm sad to see there won't be support for transform in VS "14"