GEMAPIRUBY-4 Add 'get_all_meetings' method

[JoaoCarAlmSilva]

Adds the get_all_meetings API call, which accepts a hash of options. Without additional parameters, it returns the same as get_meetings.

Important: This is currently not part of the official BigBlueButton API.

Its main purpose is to allow custom APIs to implement additional parameters (e.g. to append the recordings associated with the meetings in the response) keeping the original get_meetings call untouched.

Some parameters implemented on our extension of the API:

• meetingID (string): filters meetings by meetingID; supports wildcart filtering when meetingIDWildcard=true.
• includeRecordings (boolean): appends the recordings associated with the meetings in the response.
• state (string): filters meetings by state.
• limit and offset (integer): support for pagination.

Method signature: get_all_meetings(options={})

Usage example:

get_all_meetings()
Response:
{
  :returncode => true,
  :meetings => [
    { :meetingID => "e66e88a3",
    :meetingName => "e66e88a3",
    :createTime => 1389466124414,
    ...
    },
    { :meetingID => "e66e88a4",
    :meetingName => "e66e88a4",
    :createTime => 1389466124999,
    ...
    }
  ],
  :messageKey => "",
  :message => ""
}