[Docs] Getting Started - Error Management

[yocontra]

We need a huge section for this since it is by far our hugest problem for new users.

Here are cases we need to make sure we cover:

1. Fail task and stop stream when an error occurs
   • This should be the default behavior
2. Fail task after stream finished when an error occurs
   • testing or linting
3. Log when an error occurs but stop nothing
   • for people who like partial builds

[ScottWeinstein]

And additional "requirement" - errors, either from the stream or from the task should not have gulp-internals in the stack trace.This causes lots of confusion from users of the build.

[yocontra]

@ScottWeinstein this is fixed in the new task system via nextTick-ing stuff

[phated]

Thoughts on a command line flag for partial builds?

[yocontra]

@phated Why a CLI flag?

[phated]

partial builds are the edge case, as far as I can tell. This would switch series/parallel from using bach.series/parallel to settleSeries/settleParallel internally.