fix(webpack) no longer need to remove 'fs' import at compile-time

[chrisgervang]

For #158.
Todo

• update webm-writer once Add compatibility for packing with webpack thenickdude/webm-writer-js#17 is merged
• Re-test all examples

[coveralls]

Pull Request Test Coverage Report for Build 1292560605

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 26.511%

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Totals
Change from base Build 1292514478:	0.0%
Covered Lines:	217
Relevant Lines:	709

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💛 - Coveralls