Fixed some directory problems. Made the project .net45

Fixed some directory problems. Made the project .net45 (readme.md said it requires .net45, however it defaults to .net4 when compiling).

Modified:
- `ViewResult.cs`, Replaced \ with /. Razer.ExecuteUrl will not accept \ in the path.
- `StaticContentHandler.cs`, uses Path.DirectorySeperatorChar, /, and \ to substring.

I have a feeling I missed something about the paths. However, this is the only way i could get my page to display.

Reply if you have any questions.