Add few more sequencing functions.
Merge pull request #1324 from Gozala/bug/more-seq@787390

Bug 787390 - Add few more sequencing functions. r=@erikvold
Bug 922558: Add contextMenu.PredicateContext. r=Mossop
Display paragraphs inline so that everything fits on small screen.
Merge pull request #1325 from Gozala/bug/ctxmenu-small-screen@951454

fix Bug 951454 - Display paragraphs inline so that everything fits on small screen. r=@mossop
Initial child_process work
Fix subprocess.jsm library, add some tests
Add shell fixtures, tests passing, more node-parity
Add child event tests for spawning
Add options for timeout, maxBuffer
Progress
Expose pid in subprocess, make reading of pipes async
Progress
stdin working
Add bat files for Windows
Add fixes for Windows
Progress
Fix new dynamic script testing
Refactor, fix up tests