Tags v0.1.5

in the last version, when we use site command，we are only need clone the default content, because the default content include the default theme，but when we need update the default theme，we also need update the default content，it‘s a repeat action, we must have change.

now，we split site command to two step，first clone the default content，then clone the default theme，this will help us change the default theme quickly，and reduce the count of commit

ADD

• add create theme to create site command