Remove superfluous nodes from parse tree
Capture :start and :end when parsing for interpolation
Parse strings as sequence of characters
Add failing test for normalizing string interpolation
First pass at parsing interpolation into string concatenation
Capture and normalize escape sequences in strings as characters
Simplify interpolation parsing
Refactor Rip::Compiler::ParseTreeNormalizer#normalize_string_hash and test
Transform Rip::Nodes::Interpolation
Normalize string interpolation as concatenation