* set up jest dependencies
* add parser option to eslint to support es6
* migrate first test to jest
* migrate the argv test to shpec
* convert the env and literal store tests
* convert the file-store tests
* convert the memory-store tests
* convert the hierarchy tests
* convert the provider-save test
* convert the complete test
* convert the provider test
* convert the conf test
* tweak a test that was no longer working (context changed)
* replace in place the helpers file
* remove vows dependency
* update the test invocation to rely on jest
* update the argv test to be able to use the jest --verbose option
* Some tweaks to the test to have them working
* Update node version tested (+10 +12 -9)
* Replace const by var until we drop 0.10/0.12/4 node
* Replace let by var until we drop 0.10/0.12/4 node
* upgrade yargs and async dependencies.
were breaking change, but no impact according the tests
* upgrade yargs and package-lock.json
* add node 8 to the tested versions
* add node 8 to the allowed failures as requested
* add node 9 to travis build as acceptable failure and remove node 7
* Added nconf.any method
Fixes#126
Implemented on the Provider class
Takes an array of keys, or a variable argument list
Supports both callback and non-callback invocations
* Use an explicit search base in file store test
Fixes#224
Test file was created under process.env.HOME, but test was searching in
the current working directory. If the cwd was not on the same drive as
the home directory, the test would fail.
* Added some API documentation to README for 'any'
* Tweak `.any` documentation
