Fixup install documentation to reflect new repo path
allow seetting rate subject and expiration with AddBalance api
Merge branch 'master' into shared_balances
added some comments
added *daily and *yearly for balance expiration time
started ansible vagrant box
first running vagrant-ansible version
fixed database credentials
renamed action's BalanceId to BalanceType

also added a topup test
renamed USerBalance to Account
renamed Account Type attribute

It's now AllowNegative and it's a boolean (was *prepaid/*postpaid)
Merge branch 'master' into shared_balances

Conflicts:
	engine/account.go
	engine/loader_csv_test.go
	engine/storage_interface.go
	engine/storage_map.go
	engine/storage_redis.go