Fixes for #146
bug #147 Fixes for #146 (larowlan)

This PR was squashed before being merged into the 2.0-dev branch (closes #147).

Discussion
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Fixes for #146

Demonstrates bug in #146
Basically Guzzle 4.0 doesn't support boolean header values.
So for special case of Https, we convert that to 'on'.
Not sure if anything is needed at all.

Commits
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57b5853 Fixes for #146