update signature of Touch methods
Merge branch 'add-replace-subscribers'
change return type of TouchMessage from Message* to string
add possibility to specify timeout when touching the message
update README and gofmt
fix panic from not checking error in pushmessages return
Merge pull request #12 from iron-io/update-touch-signature

Update touch signature
Merge pull request #14 from iron-io/fix-panic

fix panic from not checking error in pushmessages return