Update README documentation

* Add a "What's New" section to point folks to the Changelog file
* Update regression suite information on where to get it and how to use
  it
Add a comment about keeping build and install dirs separate.
Fix the English on that additional comment.
Merge pull request #272 from thewacokid/master

Fix plfs-yaml lib output name
Merge pull request #271 from dshrader/master

Update to README
Fix some compiler warnings reported by Clang 3.4.0
Merge pull request #276 from thewacokid/master

Updated hashing...
Merge pull request #274 from zhang-jingwang/master

Fix some compiler warnings reported by Clang 3.4.0
Merge branch 'master' of https://github.com/plfs/plfs-core

Conflicts:
	src/LogicalFS/Container/container_internals.cpp
Removed -Winit-self