fix(#81): change rxjs to event emitter

[razvangeangu]

This will make sure the events are fired only once.

[jeserkin]

Would @jthoms1 be so kind to review this PR?
Thank you.

[rsurjano]

throwing when compiling with angular

src/directives/angular-component-lib/utils.ts(27,45): error TS6133: 'el' is declared but its value is never read.

since el parameter is unused in new implementation

[markacianfrani]

This fixes #81 . Currently any custom events that you listen for will fire twice.