login functions

[KevCaz]

This PR:

• adds a set of login functions (see ?set_login):
  • the login is now a set two environment variables that can be set interactively;
  • the env variables are stored for the current R session;
  • they can be set permanently);
  • connection are now as simple as connect();
• tests this set of functions;
• urlEncode() is back and tested.

So far all tests pass successfully but the ones that call privateImport().

[KevCaz]

May be we should wait till the issue with privateImport() is solved so I can add the fix to this PR.

[KevCaz]

to_dataframe() is now called toDataframe(): it is siimpler and more efficient. So far only _links columns is removed. Next will be to add helper function that parse this column.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@9b76bc0). Click here to learn what that means. The diff coverage is 42.35%.

@@           Coverage Diff            @@
##             master      #8   +/-   ##
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  Coverage          ?   28.8%           
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  Files             ?      12           
  Lines             ?     184           
  Branches          ?       0           
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  Hits              ?      53           
  Misses            ?     131           
  Partials          ?       0

Impacted Files	Coverage Δ
R/cleanSpecies.R	0% <ø> (ø)
R/resource.R	0% <ø> (ø)
R/count.R	0% <ø> (ø)
R/validateDataset.R	0% <ø> (ø)
R/importDataset.R	0% <ø> (ø)
R/connect.R	0% <0%> (ø)
R/parseErrors.R	0% <0%> (ø)
R/set_login.R	0% <0%> (ø)
R/query.R	0% <0%> (ø)
R/queryRaw.R	0% <0%> (ø)
... and 2 more

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[KevCaz]

I'll merge this as login works as expected.

• to_document => toDocument() has been reviewed and tested.
• parseLinks() added