Update README.md to include the dependency to kernel-devel

Update README.md to include the dependency to kernel-devel since
linux/list.h is included instead of hard-copied into the obix
package.
Updating for 1.1.2 release
Merge pull request #35 from anross/devel

Updating for 1.1.2 release
Updated to work on RHEL with 2.x kernel
Supplement an extra parameter to for_each_file_name
Introduce the hash table APIs.

The hash table will play an important role in the new Device Subsystem,
providing a quick search method from a device contract's href to its
descriptor.