sqlite-utils bulk command

* sqlite-utils bulk command, closes #375
* Refactor import_options and insert_upsert_options, refs #377
* Tests for sqlite-utils bulk, refs #377
* Documentation for sqlite-utils bulk, refs #377

tests/test_cli_bulk.py

@@ -0,0 +1,57 @@
+from click.testing import CliRunner
+from sqlite_utils import cli, Database
+import pathlib
+import pytest
+
+
+@pytest.fixture
+def test_db_and_path(tmpdir):
+    db_path = str(pathlib.Path(tmpdir) / "data.db")
+    db = Database(db_path)
+    db["example"].insert_all(
+        [
+            {"id": 1, "name": "One"},
+            {"id": 2, "name": "Two"},
+        ],
+        pk="id",
+    )
+    return db, db_path
+
+
+def test_cli_bulk(test_db_and_path):
+    db, db_path = test_db_and_path
+    result = CliRunner().invoke(
+        cli.cli,
+        [
+            "bulk",
+            db_path,
+            "insert into example (id, name) values (:id, :name)",
+            "-",
+            "--nl",
+        ],
+        input='{"id": 3, "name": "Three"}\n{"id": 4, "name": "Four"}\n',
+    )
+    assert result.exit_code == 0, result.output
+    assert [
+        {"id": 1, "name": "One"},
+        {"id": 2, "name": "Two"},
+        {"id": 3, "name": "Three"},
+        {"id": 4, "name": "Four"},
+    ] == list(db["example"].rows)
+
+
+def test_cli_bulk_error(test_db_and_path):
+    _, db_path = test_db_and_path
+    result = CliRunner().invoke(
+        cli.cli,
+        [
+            "bulk",
+            db_path,
+            "insert into example (id, name) value (:id, :name)",
+            "-",
+            "--nl",
+        ],
+        input='{"id": 3, "name": "Three"}',
+    )
+    assert result.exit_code == 1
+    assert result.output == 'Error: near "value": syntax error\n'