- 'beta' and renaming is unnecessary

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

- Currently can't building because not found const variables

- panic built-in function is always exist of program. Remove else and
  export 'ks' variable in the main function

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

Included sentence on opam config env, and running a test binary.

 Removed unused utility functions and renamed variables

Both samples/sample.c and bindings/haskell/sample/Sample.hs produce the same
output

* ks_free: The 'p' argument should have type unsigned char* to match the type of the 'encoding' argument to ks_asm