add regex option for specifying a set of file extensions

[stoikerty]

Right now, if I have several files that are required within webpack using file-loader. Those are png's, svg's etc but they're not being included in the output manifest-file. To allow those files to be added to the manifest, I've added the extensionsRegex-option to the constructor.

Example:

new ManifestRevisionPlugin(
  path.resolve(PATHS.build, 'manifest.json'),
  {
    rootAssetPath: PATHS.rootAssetPath,
    ignorePaths: [],
    extensionsRegex: /\.(jpe?g|png|gif|svg)$/i,
  }
),

Using this option, all assets are included appropriately in the resulting manifest-file for my particular case.

This PR might also solve Issue #12.

[nickjj]

Looks good and this is a pretty big deal. Thanks for the contribution.

[stoikerty]

Awesome, thanks for merging that! You're welcome 😃
I was just about to add a reference to the Readme.
Created a follow-up PR for it #20

[stoikerty]

@nickjj
Let me know when you've done the release so we can update our package.json with the npm reference.

[nickjj]

@stoikerty Just pushed v0.3 with it. It should be on npm (or within seconds).

[stoikerty]

That was wicked fast! thanks