Better error messages and API tweaks

[justin808]

• Added better error messages for missing files.
• Added api to check if the manifest exists.

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This change is 

[jonathanphilippou]

Made suggestions

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Reviewed 8 of 8 files at r1.
Review status: all files reviewed at latest revision, 3 unresolved discussions.

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README.md, line 144 at r1 (raw file):

The `asset_pack_path` helper provides the path of any given asset that's been compiled by webpack.
Note, this path is a subdirectory public.

Grammer

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lib/webpacker_lite/configuration.rb, line 53 at r1 (raw file):

  private
    def load_data
      # binding.pry

remove

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lib/webpacker_lite/manifest.rb, line 54 at r1 (raw file):

    def missing_manifest_file_error(path_object)
      # binding.pry

remove

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Comments from Reviewable

[justin808]

Review status: 5 of 8 files reviewed at latest revision, 3 unresolved discussions.

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README.md, line 144 at r1 (raw file):

Previously, Conturbo (Jonathan Andrew Philippou) wrote…

Grammer

Done.

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lib/webpacker_lite/configuration.rb, line 53 at r1 (raw file):

Previously, Conturbo (Jonathan Andrew Philippou) wrote…

remove

Done.

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lib/webpacker_lite/manifest.rb, line 54 at r1 (raw file):

Previously, Conturbo (Jonathan Andrew Philippou) wrote…

remove

Done.

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Comments from Reviewable

[jonathanphilippou]

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Reviewed 3 of 3 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable