Move all firbase dependencies from actions layer to firebaseService layer (#13)

app/services/votes/IVoteService.ts

@@ -1,4 +1,5 @@
 import { User } from 'domain/users'
+import { Vote } from 'domain/votes'
 
 /**
  * Vote service interface
@@ -7,5 +8,7 @@ import { User } from 'domain/users'
  * @interface IVoteService
  */
 export interface IVoteService {
-
+  addVote: (vote: Vote) => Promise<string>
+  getVotes: () => Promise<{[postId: string]: {[voteId: string]: Vote}}>
+  deleteVote: (voteId: string, postId: string) => Promise<void>
 }