New command line utility, lz4 (notice the missing final 'c'), with gzip-style arguments (issue 83)

lz4c still there, supports additional gzip arguments, but also keep compatibility with legacy commands
lz4 (& lz4c) display version number
Fix : Sun Studio : compatible #pragma directive (issue 81)
Fix : compatible with Objective-C (iOS) (issue 79)
Fix : minor warnings using Visual Studio x64 (issue 80)
Changed : source file lz4c.c renamed lz4cli.c