[neo-project/neo] Limit the number of `StackItem` (#345)

You can view, comment on, or merge this pull request online at:

https://github.com/neo-project/neo/pull/345

— Commit Summary —

* Limit the number of `StackItem`

— File Changes —

M neo/SmartContract/ApplicationEngine.cs (50)

— Patch Links —

https://github.com/neo-project/neo/pull/345.patch
https://github.com/neo-project/neo/pull/345.diff