Using db.XX.count in pager to count results

[pborreli]

Closes #103

Before:

db.book.find().sort({ "title.name": 1 });
db.book.find().skip(0).limit(25).sort({ "title.name": 1 });

After:

db.book.count();
db.book.find().skip(0).limit(25).sort({ "title.name": 1 });

[dunglas]

Thanks.