Commit 7de26d3

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Merge pull request #221 from FrankSalad/v3-exists-fn

V3 exists fn

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`@@ -25,6 +25,15 @@ firestack.database()`
`25`	`25`	`});`
`26`	`26`	```
`27`	`27`
	`28`	`+Test value exists at location:`
	`29`	+```javascript
	`30`	`+firestack.database()`
	`31`	`+ .ref('posts/1234')`
	`32`	`+ .on('value', (snapshot) => {`
	`33`	`+ const exists = snapshot.exists();`
	`34`	`+ });`
	`35`	+```
	`36`	`+`
`28`	`37`	`Basic write with priority example:`
`29`	`38`	```javascript
`30`	`39`	`firestack.database()`

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Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,6 @@ export default class Snapshot {`
`22`	`22`	`this.ref = ref;`
`23`	`23`	`this.key = snapshot.key;`
`24`	`24`	`this.value = snapshot.value;`
`25`		`- this.exists = snapshot.exists \|\| true;`
`26`	`25`	`this.priority = snapshot.priority === undefined ? null : snapshot.priority;`
`27`	`26`	`this.childKeys = snapshot.childKeys \|\| [];`
`28`	`27`	`}`

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