Revert "Update README.md"

This reverts commit 1d830077973d2ad0fe2b7d9b35da6e697ae0937b.
Revert "Merge pull request #12 from gaye/bump-marionette-client-to-1.1.5"

This reverts commit 9f47ac42b707f437df9219667f5b4c15c9eaa60f, reversing
changes made to af7758928e2e2024c614672a4cca13483df7f34c.
Revert "Merge pull request #11 from hfiguiere/bug980541"

This reverts commit af7758928e2e2024c614672a4cca13483df7f34c, reversing
changes made to 848a4eacbd0f22e940856e87e435fc550c6b80a4.
Bug 986206 - Report filenames on test failures
Merge pull request #13 from gaye/bug-986206

Bug 986206 - Report filenames on test failures
Bug 962918 - Update marionette-client to 1.1.5
Merge pull request #14 from KevinGrandon/bug_962918_client_screenshots

Bug 962918 - Update marionette-client to 1.1.5