lz4 128 -> 129

- New: LZ4_compress_fast()
- Changed: New lz4 and lz4hc compression API. Previous function
  prototypes still supported.
- Changed: Sparse file support enabled by default
- New: LZ4 CLI improved performance compressing/decompressing multiple
  files
- Added: LZ4_compress_destSize()
- Fixed: GCC 4.9+ vector optimization
- Changed: Enums converted to LZ4F_ namespace convention
- Added: AppVeyor CI environment, for Visual tests
- Modified:Obsolete functions generate warnings
- Fixed : Bug #75 (unfinished stream)
- Updated: Documentation converted to MarkDown format