Assimilate concat pipe module.

[ryanelian]

Currently concat task relies on gulp-concat and event-stream by making multiple pipes and then merging them.

Adding salt to the pain, the gulp.src relies on array of string containing relative / absolute file paths, not resolved file paths. Not to mention that concatResolution getter property on CompilerSettings is using synchronous resolve logic.

By rewriting, performance can be improved and at the same time removing 2 dependencies from the project.

how-to:

• https://github.com/gulpjs/vinyl-fs/blob/master/lib/src/index.js
• https://github.com/alexmingoia/gulp-file/blob/master/lib/file.js

EDIT: rewritten concatenation list resolution using async-await Promise.

[ryanelian]

Resolved with 09fb668