Separate nuget packages for Core logic and Middleware/s

[bvillanueva-mdsol]

This library needs to separate nuget packages for Core logic and Middleware/s to easily adapt to platforms and framework.

• create a core nuget package
• create a nuget package for owin middleware framework
• create a nuget package for asp net 4 framework (ex. http module)
• core nuget package should be compatible with dot net core (include dot net core middleware capability)

[jcarres-mdsol]

Can you write specifics as this?

• create a core package
• move owin out

etc.

So we can keep track of the progress

[bvillanueva-mdsol]

@jcarres-mdsol Updated descriptions. Thanks!