Added documentation for passing the token as header
The documentation was unclear about how to pass the api private token as
header. Updated the doc to include the nessesary information bits and
added an example using the curl command line client.
remove incorrect information about the api version
The API version is currently not equal to the gitlab major version number. Gitlab 4.1
still uses API version 3. Point to the lib/api.rb file instead which contains the