Move .feature files next to _test.go files

[aaronc]

Summary

Move Gherkin .feature files into the same folders where the corresponding _test.go files are for better code locality.

Problem Definition

Currently .feature files are in a features/ sub-directory. It's hard to navigate back and forth between the tests and their corresponding .feature files with this structure.

Proposal

Put .feature files in the same directory where the tests actually live so we have a structure like:

• msg_foo_bar.go
• msg_foo_bar_test.go
• msg_foo_bar.feature

This will put all the related gherkin, test, implementation code right next to each other in the file browser.

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