Add Likes Statistics Service

[antonkomarev]

What to do

1. Count likes of the Entity within date.
2. Count dislikes of the Entity within date.
3. Count likes\dislikes of the Entity within date.
4. Get all the Entities which were liked within date (with likes meta info).
5. Get all the Entities which were disliked within date (with likes meta info).
6. Get all the Entities which were likes\disliked within date (with likes meta info).

API Design Mockup

Where Scopes

• Add method scopeWhereLikedByDate to service layer.
• Add method scopeWhereLikedByDate to Likeable models.
• Add method scopeWhereLikedBetweenDates to service layer.
• Add method scopeWhereLikedBetweenDates to Likeable models.
• Add method scopeWhereDislikedByDate to service layer.
• Add method scopeWhereDislikedByDate to Likeable models.
• Add method scopeWhereDislikedBetweenDates to service layer.
• Add method scopeWhereDislikedBetweenDates to Likeable models.

Counters

• Add method countLikesByDate to service layer.
• Add method countLikesByDate to Likeable models.
• Add method countLikesBetweenDates to sevice layer.
• Add method countLikesBetweenDates to Likeable models.

Split LikeableService by adding CounterService (?)

• Move method incrementLikesCount to CounterService from LikeableService
• Move method decrementLikesCount to CounterService from LikeableService
• Move method incrementDislikesCount to CounterService from LikeableService
• Move method decrementDislikesCount to CounterService from LikeableService
• Move method removeLikeCountersOfType to CounterService from LikeableService
• Move method scopeOrderByLikesCount to CounterService from LikeableService
• Move method fetchLikesCounters to CounterService from LikeableService

[antonkomarev]

Counts by date could use Counting related models

[antonkomarev]

This feature is on hold before v7 because I've completely revised an API of the next package version.
More details about v6: #15