Add option to sendkeys to input

[ofirdagan]

The thing that will really let us boost up our tests and give us much better coverage and usage testing is giving the option to set text and clear an input field.

Protractor syntax is:

$('#address-input').sendKeys(value);
$('#address-input').clear()

10x

[talkol]

@doronpr @ofirdagan take a look at the commit d43b17d, adding actions (as long as they're covered in EarlGrey) is almost immediate.

All EarlGrey actions described here: https://github.com/google/EarlGrey/blob/master/EarlGrey/Action/GREYActions.h