removes a tool from all toolbars and it's definition
function(toolKey){
			delete taTools[toolKey];
			angular.forEach(toolbars, function(toolbarScope){
				delete toolbarScope.tools[toolKey];
				for(var i = 0; i < toolbarScope.toolbar.length; i++){
					var toolbarIndex;
					for(var j = 0; j < toolbarScope.toolbar[i].length; j++){
						if(toolbarScope.toolbar[i][j] === toolKey){
							toolbarIndex = {
								group: i,
								index: j
							};
							break;
						}
						if(toolbarIndex !== undefined) break;
					}
					if(toolbarIndex !== undefined){
						toolbarScope.toolbar[toolbarIndex.group].slice(toolbarIndex.index, 1);
						toolbarScope._$element.children().eq(toolbarIndex.group).children().eq(toolbarIndex.index).remove();
					}
				}
			});
		}