Allow adding to current entry

[ylavoie]

The plugin overwrite the current entry instead of adding to it.
What about if the user has other objects instead of only html files and want all?

[gwuhaolin]

                new WebPlugin({
			// file name or full path for output file, required.
			// pay attention not to duplication of name,as is will cover other file
			filename: 'index.html',
			// this html's requires entry,must be an array.dependent resource will inject into html use the order entry in array.
			requires: ['A', 'B'],
		})

[ylavoie]

Then what about the ones that aren't required by html? I have 128 html files to add as entries and a bunch of Dojo files, that I need preloaded.
To scan the html files, I need AutoWebPlugin, not WebPlugin, or I'll have to enumerate them manually.

[ylavoie]

I'd suggest modifying the AutoWebPlugin to allow an optional 3rd parameter, which would be the remainder of the desired entries, as such:

        constructor(pageDir, options, initialEntries) {
                options = Object.assign({}, options);
                this.options = options;
                this.entryMap = {};
                this.webpackEntry = initialEntries || {};

Then one can call it with the desired other entries:

    entry: autoWebPlugin.entry({
          'Configuration': 'Configuration/',
          'Contact_contact': 'Contact/contact.html',
          'Contact_pricelist': 'Contact/pricelist.html',
      },{
      'lsmb': 'lsmb/main',
      'login': 'lsmb/login',
      'lib': [
        'dojo/dom',
        'dojo/dom-style',
        'dojo/ready',
        'dojo/on',
      ]
    }),