Rectify filenames when using travis to publish artifacts

[luclu]

Electron-builder's built-in artifact uploader (e.g. github releases) will use the automatically generated filenames for the binaries and omit our post-hook renaming.

Investigate if:

1. those names can be updated internally, which would make the post-hook obsolete
2. a gulp compatible uploader should be used instead of electron-builder's internal

Note: electron-builder doesn't support uploading to azure, if this was planned to be used gulp-azure-storage could be leveraged instead (2).

[luclu]

Update

(1) looks like it would require a PR to electron-builder (there are quite some inconsistencies like productName is used for windows and mac but not for linux + different internal naming schemes for platforms)
(2) seems feasible using gulp-github-release, though need to check its behaviour (i.e. if it will create tags on its own); + switching to gulp-azure-storage will be easy using this route
3. use non-final binary names from electron-builder to upload and use github's API to rectify the names (rather hacky)

[luclu]

Route (2)'s progress on #1578

[lock]

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