Add password recovery instructions - Part 1

[tulioag]

Part 1 for #4
Included

• Developer can show/hide the "Forgot password" button
• Component should provide a callback (event) when the button is clicked

Not included

• Developer is responsible for create how the instructions will be present to user

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This change is 

[alexberazouski]

Reviewed 4 of 5 files at r1.
Reviewable status: 4 of 5 files reviewed, 1 unresolved discussion (waiting on @tulioag)

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src/vaadin-login.html, line 257 at r1 (raw file):

          <vaadin-button class="login-button" theme="primary">Log in</vaadin-button>

          <vaadin-button id="forgotPasswordButton" class="forgot-password-button" theme="tertiary small" on-click="_forgotPassword" hidden="[[hideForgotPasswordButton]]">Forgot password</vaadin-button>

We should set the value to a hidden attribute directly

[tulioag]

Reviewable status: 3 of 5 files reviewed, 1 unresolved discussion (waiting on @alexberazouski)

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src/vaadin-login.html, line 257 at r1 (raw file):

Previously, alexberazouski wrote…

We should set the value to a hidden attribute directly

Done.

[alexberazouski]

Reviewed 2 of 2 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved

[coveralls]

Pull Request Test Coverage Report for Build 19

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 92.857%

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Totals
Change from base Build 9:	0.5%
Covered Lines:	10
Relevant Lines:	10

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💛 - Coveralls