Bug 870677 - Adding './' as shortcut for 'data' folder in existing API

- Fixed bug introduced
- Removed priviled-panel add-on (now the test is in test-panel)
Merge pull request #1552 from ZER0/data-shortcut/870677

Bug 870677 - Adding './' as shortcut for 'data' folder in existing API a=@gozala
Bug 1039825 - "ReferenceError: newTab is not defined" running `test-widget`

- Added `.catch(assert.fail)` after each `openNewWindowTab` calls
- Removed unused and undeclared `newTab` variable
Bug 1039880 test modules that failed to load were being skipped
Merge pull request #1555 from erikvold/1039880

Bug 1039880 test modules that failed to load were being skipped r=@jsantell
Merge pull request #1553 from ZER0/test-widget/1039825

fix Bug 1039825 - "ReferenceError: newTab is not defined" running `test-widget` r=@erikvold
Implement devtool toolbox panel API.
Merge pull request #1509 from Gozala/devtools

Bug 980410 - Implementation of toolbox panel r=@jsantell
Fix missing license headers.
Merge pull request #1556 from Gozala/master

Fix missing license headers. r=@erikvold
Fix missing license header a=me
Bug 866733 - Replace 'for each (v in iterable)' loops

Replace deprecated 'for each (v in iterable)' syntax
with 'for (v of iterable)'

There are several remaining uses of 'for each' which
iterate over objects that are not iterables.
Merge pull request #1557 from robertknight/866733-replace_for_each_loops

fix Bug 866733 - Replace 'for each (v in iterable)' loops r=@ZER0
bug 1036658 - shorten test timeout unless on CI
Bug 1040432 - Move sdk/system/xul-app to a jsm so that cuddlefish/toolkit loaders can access it easily. r=Mossop
bug 1041844 - disable e10s tests on aurora, beta
Merge pull request #1559 from zombie/1036658-short-timeout

bug 1036658 - shorten test timeout unless on CI, r=@Mossop
Merge pull request #1560 from zombie/1041844-e10s-beta

bug 1041844 - disable e10s tests on aurora, beta, r=@erikvold
Bug 1038381 - Replace usage of @test/options with sdk/test/options
Merge pull request #1563 from erikvold/1038381

Bug 1038381 - Replace usage of @test/options with sdk/test/options r=@gozala