(GH-125) added %HOME/.dotnet/tools
(GH-125) added %HOME/.dotnet/tools

to the search path for Cake.

Also, restructured the search order:
* cake.exe in /tools/
* dotnet-cake[.exe] in %HOME%/.dotnet/tools
* dotnet-cake[.exe] in %PATH%
* cake.exe in %PATH%

cake-build/bakery,cake-build/bakery