snapcraft.yaml: Bump version to 0.17 for release

Update release-notes.md

bump 0.16 to the correct date and add meta generator note.

version bump to v0.15

Updating the final release notes for v0.13

Bumping Version

Updating tag

Adding the right date for the release of 0.10

Updated release notes.

Merge pull request gohugoio#11 from noahcampbell/master

Removing OSX files from repo.  Updating .gitignore to not track these files