Added abitlity to load from an already loaded file content (e.g. loaded from URL)

[opoto]

Added:

• FileLoader.loadData(data, name, ext) where:
  • data is the input data to load (a GeoJson, GPX or KML)
  • name is the name of the data (file name, URL, etc)
  • ext is an optional parameter to set data type in order to force parser type
• fire 'data:error' if load/loadData mandatory parameters are missing
• trick to allow testing of load file (set file.testing to true to skip reader load)
• tests for loadData

Sample usage (with JQuery):

  $.get('https://my.server.com/?id=89798747&type=3', function(data){
    fileloader.loadData(data, '89798747', 'gpx');
  });

[opoto]

Hi. Thanks for the review. I fixed eslint errors you listed, plus no-unneeded-ternary and consistent-return errors that were also reported. I ignored warnings (which anyway are not related to my changes), and left the no-undef and global-require errors which are not related to my changes neither.

[SBats]

Wonderfull ! Thank you again for this great contribution !