Fix(karma): Fix Proper incremental test running.

[gerbal]

Resolves #871

Declaring __karmaWebpackManifest__ as a new Arrray() breaks incremental the incremental test runner. As it prevents __karmaWebpackManifest__ from updating with as the webpack manifest changes.

The ugly fast fix is to use an array literal and terminate the statement with a ';' to avoid regressing #709

[gerbal]

After further experimentation and exploration, the solution to this one is really easy. Simply excluding test-bundler from test coverage appears to resolve the issue.

[codecov-io]

Current coverage is 70.58% (diff: 100%)

Merging #918 into master will not change coverage

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[dvdzkwsk]

Looks like this got fixed in another PR (the Array -> [] fix). Not sure the exclude is necessary since we have an explicit include, but if I'm wrong in that please let me know and I can rebase this and merge that fix.

Thanks!