FeatureFor blade directive

[victorlap]

Description

I have added the @featurefor blade directive, to easily use the isEnabledFor() method.

Motivation and context

This change is to complement the already existing @feature blade directive.

How has this been tested?

I have test this the same way the laravel blade directives are tested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have read the CONTRIBUTING document.
• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful.
• I have added tests to cover my changes.
• If my change requires a change to the documentation, I have updated it accordingly.

[victorlap]

P.S. I rebased on top of 0.2.0 to have a working test suite. However, I could not select that tag to create the pull request on. If you update master to 0.2.0, all should be well.

[francescomalatesta]

Try now :)