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Merge pull request #106 from tcarnus/patch-1

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Upgrade roxygen
Thoughts on initial envvar approach
Fix example
Imrpvoments to body
* can upload single file
* can encode as json
Closes #103.
Disable envvar docs
Correct a couple of variable names
Don't use basicHeaderGatherer(). Closes #100
Add experimental progress bar. Closes #17
Add issue number
Return correct type so rcurl aborts
Use ... in with_verbose. Add more docs
Don't import complete RCurl namespace
Use curl api to reset status. Closes #112
Avoid printing binary content
Proof read news
Better printing logic
Add oauth demos to release check.
Closes #69
Remove unneeded roxygen field