Create a global instance for each module which any of other modules can access

[carloshpds]

That's a huge refactoring. To make sense, we need to analyse each file and transform the tasks into a functions that will be exported like an API which other modules can access by something like this:

options.modulesData.module.instance.task()

pros:

• Do not need to use require to access a module anymore, so.. new external modules can access other modules more easily than currently.
• We can make contextual changes, like compile only the file which has changed.
• Do not need to use gulp.start() anymore, preventing some trouble in the future cause gulp team will remove this method soon. gulp#505 gulp#355
• It will make possible to test tasks.

cons:

• It will take a lot time to get done.