[#3] Added the ability to compile a library.

The project will now generate a binary and a library. This is so that
the compiler can be used in other programs as well.

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "arcanum"
+version = "0.0.0"

src/compiler.rs

@@ -0,0 +1,3 @@
+pub struct Compiler
+{
+}

src/lib.rs

@@ -0,0 +1,4 @@
+mod compiler;
+
+
+pub use self::compiler::Compiler;