Bug 994707 - Provide the crash events path as an environment variable for the crashreporter. r=ted

--HG--
extra : rebase_source : 96388b73c887a71fae9039a071e4733c9302eb61
Bug 994707 - Introduce crash submission events and handle them. r=bsmedberg

This introduces a new crash event type for submissions and handles
them in the Crash Manager. These crash submissions will also be counted
in FHR.

--HG--
extra : rebase_source : c37fc86cecc86aea0afdd8cfa7b31295aad3d6f8
Bug 994707 - Write crash submission events. r=ted

--HG--
extra : rebase_source : 11f614bdb0c8f6bf63ddc937957b89b7184eaad9