New : lz4cli sparse file support

New   : command -m, to compress multiple files in a single command
Fixed : Restored lz4hc compression ratio
New   : lz4 cli supports long commands
New   : lz4frame & lz4cli frame content size support
New   : lz4frame supports skippable frames
Changed:Default "make install" directory is /usr/local
New   : lz4 cli supports "pass-through" mode
New   : datagen can generate sparse files
New   : scan-build tests
New   : g++ compatibility tests
New   : arm cross-compilation test
Fixed : Fuzzer + frametest compatibility with NetBSD (issue #48)
Added : Visual project directory
Updated:Man page & Specification