Merge pull request #12 from adrinux/fix-deprecated-variable-refs

Update legacy variable substitution syntax deprecated in ansible 1.2 for timezone role.
Update list of contributors
Merge pull request #13 from adrinux/fix-deprecated-variable-refs

Update legacy variable substitution syntax deprecated in ansible 1.2, hostname role
Merge branch 'master' of https://github.com/pjan/the-ansibles