Copy shortening and authentication page title simplifications.

* Integrate @ryanfeeley's suggested copy changes.
* Simplify the way the title is displayed on the authentication page. Instead of using JS to display the appropriate title, use CSS.
Clean up the text for transition_to_primary
Fix the failing front end tests

* A .description element no longer exists
* Move the #upgrade_to_primary id to what used to be the .description element.
Merge pull request #3684 from mozilla/issue_3609-dialog_copy

Copy shortening and authentication page title simplifications.

I rebased and can now merge cleanly. Thanks @seanmonstar for reviewing!

merging.
Check for failures in provisioning after returning from an IdP.

* This is a standin for checking for disabled 3rd party cookies. If we expect
provisioning to succeed, but it fails, this is probably due to disabled 3rd party cookies.

fixes #3520
Update text with @ryanfeeley's suggestions.

Thanks @ryanfeeley!
Update with @seanmonstar's suggestions for escaping.
Merge pull request #3690 from mozilla/issue_3520-3p_cookies_disabled

Check for failures in provisioning after returning from an IdP.
Move context request from xhr.js to network.js
Clean up

Get rid of duplicate state held in top level variables and within context.
publish context_info with the full updated context, not just the passed in context.
Add is* functions to helpers, use isObject to ensure setContext is called with valid parameters.

* add isArray, isFunction, isObject, isString
Clear all timeouts between tests to prevent cross-test pollution.
Update with suggestions made by @6a68. Thanks man!
Merge pull request #3667 from shane-tomlinson/issue_3666_context_out_of_xhr

Issue 3666 context out of xhr

@6a68 gave the r+. Backend tests pass. Selenium tests pass. Frontend tests pass. Merging.
Fix the xhr_delay being called on every request.

fixes #3695
Remove unneccesary app = undefined
Merge pull request #3696 from mozilla/issue_3695_xhr_delay

Fix the xhr_delay being called on every request.
Bump jschannel to 65356ba, add git sha to file
Add git sha to local copy of winchan