Razor view engine performs case insensitive lookup for precompiled views

[pranavkm]

As part of addressing the issue in https://github.com/aspnet/MvcPrecompilation/issues/37, we have made lookups for precompiled views case insensitive all the time.

• With this change, a precompiled lookup for a file that was compiled at the path /Views/Home/index.cshtml (note the case) would succeed for controller=Home,Action= Index`.
• Runtime compiled view lookups remain dependent on the behavior of the file system \ file provider. The file listed above would not be located on case sensitive file systems when performing compilation at runtime.

[pranavkm]

Please use https://github.com/aspnet/MvcPrecompilation/issues/136 for further discussion.