Merge pull request #79 from samoht/master

Fixes
updated README.md to work with current Irmin API;
Merge pull request #89 from niksu/updated_readme

updated snippet in README.md to work with current Irmin API;
Merge pull request #97 from samoht/no-core-kernel

No core kernel
Merge pull request #98 from samoht/master

Update CHANGES
Merge pull request #100 from samoht/master

All the examples compile again
Add magic runes to ease release
opam lint