## 0.5.5

### New Features

* Added support for merging two `PathGraph`s via disjoint union to allow results from multiple data flow computations in a single `path-problem` query.

### Major Analysis Improvements

* The main data flow and taint tracking APIs have been changed. The old APIs
  remain in place for now and translate to the new through a
  backwards-compatible wrapper. If multiple configurations are in scope
  simultaneously, then this may affect results slightly. The new API is quite
  similar to the old, but makes use of a configuration module instead of a
  configuration class.

### Minor Analysis Improvements

* Data flow through `initialize` methods is now taken into account also when the receiver of a `new` call is an (implicit or explicit) `self`.
* The Active Record query methods `reorder` and `count_by_sql` are now recognized as SQL executions.
* Calls to `ActiveRecord::Connection#execute`, including those via subclasses, are now recognized as SQL executions.
* Data flow through `ActionController::Parameters#require` is now tracked properly.
* The severity of parse errors was reduced to warning (previously error). 
* Deleted the deprecated `getQualifiedName` predicate from the `ConstantWriteAccess` class.
* Deleted the deprecated `getWhenBranch` and `getAWhenBranch` predicates from the `CaseExpr` class.
* Deleted the deprecated `Self`, `PatternParameter`, `Pattern`, `VariablePattern`, `TuplePattern`, and `TuplePatternParameter` classes.