Offline page assets

[galvez]

I already tested this in my main test project, but can I have an extra pair of eyes here?

I'm using it like this:

      workbox: {
        offlinePage: '/offline/offline.html',
        offlinePageAssets: ['/offline/offline.png'],

I thought it was better to be able to specify offlinePage-specific assets rather than adding extra glob patterns to capture images in ~/assets.

[codecov]

Codecov Report

Merging #85 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop    #85   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            1      1           
  Lines            1      1           
======================================
  Hits             1      1

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