quickscope 0.1.2

Multi-layer HashMap and HashSet implementations for performant representation of variable scopes
Documentation 
### 0.1.2


* Added `.iter()`, `.iter_mut()`, `.iter_top()`, `.keys()`, and `.keys_top()` methods to `ScopeMap`
* Added `.iter()` and `.iter_top()` methods to `ScopeSet`

### 0.1.1


* Added `.define_parent()` method to `ScopeMap` and `ScopeSet`

### 0.1.0


* Initial release