[TIMOB-8678] iOS: Webcolor colorForHex returns incorrect values for some strings

// According to the following test case:
// Android does not currently support: brown. The color yellow is used when a name is not recognised.
// iOS does not currently support: aqua, fuchsia, lime and maroon.  The color black is used when a name is not recognised.

// stripped for tableview background color still to be tested

var webcolor = [
  'black', 'gray', 'darkgray', 'lightgray', 'white', 'red', 'green', 'blue', 'cyan', 'yellow',
  'magenta', 'orange', 'purple', 'brown', 'transparent',
  'aqua', 'fuchsia', 'lime', 'maroon', 'pink', 'navy', 'silver', 'olive', 'teal'];

var webcolorPointer = 0;

var win = Ti.UI.createWindow({
  backgroundColor: webcolor[webcolorPointer],
  exitOnClose: true,
  fullscreen: false,
  layout: 'vertical',
  title: 'Webcolor Demo'
});

var label = Ti.UI.createLabel({
  backgroundColor: 'white',
  text: webcolor[webcolorPointer]
});
webcolorPointer++;

win.add(label);

// click window to iterate through color array
win.addEventListener('click', function(e){
  e.source.backgroundColor = webcolor[webcolorPointer];
  label.text = webcolor[webcolorPointer];
  webcolorPointer++;
  if(webcolorPointer === webcolor.length){
    webcolorPointer = 0;
  }
});

win.open();