Merge pull request #3 from beannaich/master

ConfigForm changes
Add CREDITS file.
Add zip file support via https://zipstorer.codeplex.com/ 's ZipStorer.cs code. Proper credits are given in CREDITS and the license is included in LICENSE.
Hide the temporary files as needed.
Update README.md

Was wrong about Win 8.1 having 3.5 out of the box. It doesn't.
Use %APPDATA%\Local as the storage location for temporary files. Save config when exiting ConfigForm.
Simplify the code by using a more concise method of enumerating the ROM directory.
Also, simplify the zip extraction code logic.
Use proper Bring*ToBack/Bring*ToFront helper methods.
Merge pull request #1 from thedax/master

Add thedax's changes.