Rob--W / proxy-from-env / 4

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travis-ci

Insert scheme before *_proxy variable if needed

- wget seems to require fully valid URLs.
- cURL defaults to a HTTP proxy.
- Python's urllib falls back to the original request type (scheme).

We decide to insert the original scheme if missing.
If the http_proxy environment variable still contains true garbage, then
the module still returns garbage.

15 of 15 new or added lines in 2 files covered. (100.0%)

299 of 304 relevant lines covered (98.36%)

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