add license headers and remove extern crate

examples/basic.rs

@@ -1,4 +1,6 @@
-extern crate term_grid;
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
 use term_grid::{Direction, Filling, Grid, GridOptions};
 
 // This produces:

examples/big.rs

@@ -1,7 +1,6 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-extern crate term_grid;
 use term_grid::{Direction, Filling, Grid, GridOptions};
 
 fn main() {

src/lib.rs

@@ -1,3 +1,6 @@
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
 #![warn(future_incompatible)]
 #![warn(missing_copy_implementations)]
 #![warn(missing_docs)]

tests/test.rs

@@ -1,3 +1,6 @@
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
 use term_grid::{Direction, Filling, Grid, GridOptions};
 
 #[test]