Fix bug with non-HTTP Shib sessions being valid for HTTP sessions

Previously, the `PreauthUserDetailsProvider` was only checking that a
valid Shib session existed by looking for the regular or HTTP Shib
session header. This check is now strengthened by validating the
correct header exists for the correct instance.

Also renamed and changed some things in the `Preauth` test--it's now called `HTTPPreauthUserDetailsProviderTest` to reflect the fact that it's only testing the HTTP version of `Preauth`. Along those same lines, the test user now uses the HTTP headers and has been renamed to `testuser_http.json`.

Please review: @ahoffmann 

See merge request !7

Previously, the `PreauthUserDetailsProvider` was only checking that a
valid Shib session existed by looking for the regular or HTTP Shib
session header. This check is now strengthened by validating the
correct header exists for the correct instance.

Add test for user with no email

Add a test to ensure `false` is returned for a user with no email logged in through Preauth (Shib).

Please review: @ahoffmann 

See merge request !6

Remove tests from edu\wisc\doit namespace

The tests were auto-added to the `edu\wisc\doit` namespace by IntelliJ, bundling them as a classes in our released package. Since downstream apps don't need to instantiate the tests, this removes them from the namespace.

Please review: @ahoffmann 

See merge request !5

Fix typos

`release` target will probably work better now.

Please review: @ahoffmann 

See merge request !4

Prepare project for first release

Add Composer and Phing metadata to prepare for first release.

Please review: @ahoffmann 

See merge request !3

Refactor uw-php-security to use 'Provider' classes

After a discussion about the project's design and requirements moving
forward, it was decided to refactor the project to remove
`AttributeMapper` classes and have `Provider` classes handle attribute
mapping as well as user loading. This also adds a third provider,
`PreauthHTTPUserDetailsProvider`, which can be used in environments
where Shibboleth attributes are sent as HTTP headers.

Apologies for the big PR!

Please review: @ahoffmann 

See merge request !2

After a discussion about the project's design and requirements moving
forward, it was decided to refactor the project to remove
`AttributeMapper` classes and have `Provider` classes handle attribute
mapping as well as user loading. This also adds a third provider,
`PreauthHTTPUserDetailsProvider`, which can be used in environments
where Shibboleth attributes are sent as HTTP headers.

Build improvements

Simplified build.xml to remove the self-updating of phpunit and composer. This speeds up the build. Updating can be handled by the developer as needed.

Added support for coverage reporting and SonarQube analysis.

Simplified the .gitignore file

@andrew-summers @weizhong-wang 

See merge request !1

Simplified the build.xml to remove the self-updating of phpunit and composer. This speeds up the build. Updating can be handled by the developer as needed.

Added support for coverage reporting and SonarQube analysis.

Simplified the .gitignore file