Fix BSD sed error reported by Yue Du

This change is related to LZ4 issue #14.

 - Add more unique pattern to line recognition
 - Change Extended Regular Expression to Basic Regular Expression
Merge pull request #15 from t-mat/fix-bsd-sed

Fix BSD sed error reported by Yue Du
fix : HC streaming mode
Added : HC streaming test
fix : minor compilation warning under mingw
Add .gitignore to strip down farmhash
Add minified farmhash
Add LIKELY macro for MSVC
Add FarmHash wrapper for lz4io
Add FarmHash wrapper to lz4io.c
Add function name printf() to trace
Add modified executable lz4c_farmhash to programs/Makefile