Change the response of #getUrls() to an array of objects

Needed to return more information about each API call. So now the response is
an array of objects that describe better each API method and that can be easily
expanded in the future to include more information.
setConfigXML should accept the params meetingID and configXML
Change url encoding to be exactly like BigBlueButton does

Calls to setConfigXML were failing because the string with the XML was being
encoded slightly differently from how BigBlueButton encodes it internally.
Ignore .nvmrc