Feat: added onMenuToggled event emitter, closes #35

[bennymeg]

added onMenuToggled event emitter to handle menu icon modification as per #35

[coveralls]

Pull Request Test Coverage Report for Build 608

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 57.143%

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Totals
Change from base Build 436:	0.0%
Covered Lines:	77
Relevant Lines:	127

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💛 - Coveralls

[greenkeeper[bot]]

• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 8.1.1.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 8.2.5.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 8.2.6.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 9.0.0.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 9.0.1.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 9.0.2.

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 9.1.0.

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[greenkeeper[bot]]

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• The devDependency @nguniversal/express-engine was updated from 7.1.1 to 9.1.1.

Update to this version instead 🚀