Linux v3.13 patches for building the kernel with clang.

confirmed:
make CC=clang HOSTCC=clang fs/ext4/
(oldconfig after copying fc19's kernel 3.13.7-100 configuration)
Create README.me
Add usage in README.md
fix the line length of README.md
Merge branch 'master' of github.com:takeshi-yoshimura/BuildingLinuxWithClang