Commit e7dc397

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add aggregations

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Original file line number	Diff line number	Diff line change
`@@ -179,3 +179,11 @@ or:`
`179`	`179`	`>>> val`
`180`	`180`	`[{u'all': 829.02, u'_id': 1}]`
`181`	`181`	```
	`182`	`+`
	`183`	`+Select fields to aggregate, eg. aggregate the costs for selected stores:`
	`184`	`+`
	`185`	+```
	`186`	`+>>> agr = [{ '$match': {'$or': [ { 'store_name': 'sportsmans' }, { 'store_name': 'game' }] }}, { '$group': {'_id': 1, 'sum2stores': { '$sum': '$total_costs' } }}]`
	`187`	`+>>> [a for a in transactions.aggregate(agr)]`
	`188`	`+[{u'_id': 1, u'sum2stores': 739.03}]`
	`189`	+```

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