first commit

tests/core.rs

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+extern crate parici;
+extern crate itertools;
+
+use parici::core::DocId;
+use parici::core::postings::{VecPostings, intersection};
+use parici::core::postings::Postings;
+
+#[test]
+fn test_intersection() {
+    let left = VecPostings::new(vec!(1, 3, 9));
+    let right = VecPostings::new(vec!(3, 4, 9, 18));
+    let inter = intersection(&left, &right);
+    let vals: Vec<DocId> = inter.iter().collect();
+    itertools::assert_equal(vals, vec!(3, 9));
+}