Bug 962902 - Duplicate blob url wastes 125k in the system app. r=alive

Carried over from @fabricedesre
Bug 1016854 - [Contacts] Intermittent MarionetteJS failure on Travis: Contacts > Delete > Edit menu is not visible on search mode
Merge pull request #19753 from mnjul/bug_962902_duplicate_blob_url_in_system_app

Bug 962902 - Duplicate blob url wastes 125k in the system app
Merge pull request #19830 from arcturus/contacts-intermitent-delete

Bug 1016854 - [Contacts] Intermittent MarionetteJS failure on Travis: Contacts > Delete > Edit menu is not visible on search mode
Bug 1013294 - Use the deviceRoot as provided by mozdevice. r=bsilverberg
Bug 1008187 - [Camera] Update to use <gaia-header>
Merge pull request #19765 from wilsonpage/1008187

Bug 1008187 - [Camera] Update to use <gaia-header>
Revert "Merge pull request #19736 from pivanov/bug-1017027"

This reverts commit eced604040a970e65dfb51fa83e1a18a9d00b7db, reversing
changes made to 93402e84de5a9ae3824aead5fb03ce9be984f09e.
Bug 1015056 - Follow-up, add venv and travis_venv to gitignore r=me
Revert "Merge pull request #19753 from mnjul/bug_962902_duplicate_blob_url_in_system_app"

This reverts commit 053de51fcb7d1cd0553d3dd092e1974fda62a1f3, reversing
changes made to e98fe1e94d3d80ad36903500d8ca3333904b162c.
Revert "Merge pull request #19765 from wilsonpage/1008187"

This reverts commit 392123a9c53fd9a6ccbb1c81908c3176c0647222, reversing
changes made to 54d6512f516564c23e4363ca328b2a453605617b.
Bug 966828 - [User story] Add face tracking capability