Add support for Personal Access Tokens

Merge pull request #74 from macno/master

Define TrusteeRole struct, update TrusteeRoles type in Details

Merge pull request #70 from go-gandi/tags

domain: add GetTags, SetTags and DeleteTags methods

Merge pull request #65 from go-gandi/getlivedns

domain: add GetLiveDNS method

Merge pull request #63 from go-gandi/request-error

doAskGandi returns a RequestError on HTTP failure

Merge pull request #63 from go-gandi/request-error

doAskGandi returns a RequestError on HTTP failure

Merge pull request #56 from vincentbernat/fix/signing-key-public-key

livedns: return public key and tag