Add a 'start' tailer timestamp, stop passing collection to .tailQuery() #16
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This PR fixes an issue with .OpenAt in internal/oplog/oplog_tail.go where it will start at the doc AFTER the provided time+counter instead of including the starting doc.
This change adds a 'start' bson.MongoTimestamp and the support for .tailQuery() to use that time using a "$gte" operation instead of "$gt" that the 'last' timestamp uses. This will also allow us to see the start and end time of the tailer.
Lastly, I removed passing the *mgo.Collection to .tailQuery() as this isn't used anymore.