Couple bugfixes, integration tests ported

vasm/src/lib.rs

@@ -2,9 +2,11 @@ extern crate pest;
 #[macro_use]
 extern crate pest_derive;
 
-pub mod ast;
+mod ast;
 pub mod parse_error;
-pub mod vasm_assembler;
-pub mod vasm_evaluator;
-pub mod vasm_parser;
-pub mod vasm_preprocessor;
+mod vasm_assembler;
+mod vasm_evaluator;
+mod vasm_parser;
+mod vasm_preprocessor;
+
+pub use vasm_assembler::assemble_snippet;