Issue with containsControlCharacters

[plessbd]

After debugging an issue with @desouzas, we were able to find an issue with how files are being detected as binary or not. This function seems to be where the fix needs to be (https://github.com/electron/electron-compile/blob/master/src/file-change-cache.js#L341)

Something small like:

<section class="dashboard-container">
    <dashboard></dashboard>
</section>

gets detected as binary.

However, change it to have a few more spaces

<section class="dashboard-container">
    <dashboard>   </dashboard>
</section>

and it works.

My initial solution in #119 "fixes" the issue but I do not know if that is really the right place for this.
I think an option to disable the detection of binary files, or switching to system based detection like 'file ' (https://github.com/mscdex/mmmagic) might be a better way to detect binary files