Tests fail in Visual Studio because they try to reuse the same scratch
working space, and each test is responsible for resetting the space. To
simplify the test code:
1. Make `TestBase` `IDisposable` and have it create the scratch space
2. Remove `ResetScratch()` as it is now handled by the base class
3. Add a unique ID to each scrach space folder to prevent collisions
* First pass. Writing isn't implemented on stream. Tests are busted.
* LZipReader works...no file name :(
* LZipWriter works
* Writing tests are actually correct now. LZipStream correctly writes trailer now. lzip command line tool likes it.
* Add recommendation blurb
* Update notes for formats
* LZip isn't an archive format
* Attempting to fix and implement crc32
* LZip writing test passes
* Had to invert crc to check uncompressed data.
