- Add support of EnvironmentVariables adding bool includeEnvironmentVari...

[PhilippeLeveille]

...ables arguments into Configuration class constructors

• Correction of few tests that fail when executed on a not US local culture (date mounth & day order into underlining configuration file definition)

[ChrisMissal]

Hey @PhilippeLeveille, thanks for the PR. When I originally opened up the issue to add support for more types of configurations I wasn't aware of the direction that the new aspnet5 stuff was headed. Upon more thoughts, I'm going to close up the issue since those new methods will make this library largely obsolete.

Here's some more info on how it's looking in aspnet5:

• https://github.com/aspnet/Configuration
• http://gunnarpeipman.com/2014/11/asp-net-5-new-configuration-files-and-containers/