(IN PROGRESS) Add "Run tests" button!
Use Bootstrap's form styling

As per <http://getbootstrap.com/css/#forms>.

Note that bootstrap "highly recommends using the <button> element [as
opposed to <input type="submit">] whenever possible to ensure matching
cross-browser rendering".
Update Angular from v1.2.26 to v1.3.5

According to the download dialogue at <https://angularjs.org/>, 1.2.x is
the "legacy", bugfix-only branch; 1.3.x is the "latest stable branch".

For a new development it doesn't make sense to be using a legacy branch.
But specifically I want the "ng-touched" functionality[1] for form
validation.

1.3.x drops support for IE8, but I don't intend to support any version
of IE anyway (I can't handle the test & maintenance burden).

Everything seems to still work and all the tests (all 2 of them)
continue to pass.

[1] https://code.angularjs.org/1.3.5/docs/guide/forms#using-css-classes
Hook up angular's validation to bootstrap's css styles

As per <https://stackoverflow.com/questions/14348384/>.

I'm not ready yet to commit to the custom angular directives in that
stackoverflow link, though I concede that this commit's solution isn't
very DRY.

Note that specifying the <form>'s `name` attribute makes the form
available on the angular `$scope`.
More validation: Disable submit button, show help text

I use "ng-class" instead of "ng-show" because the latter uses
"display:hidden" which changes the layout as the help text
appears/disappears.
Provide default testjob name ("master")

So that you don't have to stop and *think* just to try out the system!
See also `TODO.md`.