Add brew_reinstall rule (#816)

Replaces install with reinstall when a package is already installed.

tests/rules/test_brew_reinstall.py

@@ -0,0 +1,28 @@
+import pytest
+from thefuck.types import Command
+from thefuck.rules.brew_reinstall import get_new_command, match
+
+
+output = ("Warning: thefuck 9.9 is already installed and up-to-date\nTo "
+          "reinstall 9.9, run `brew reinstall thefuck`")
+
+
+def test_match():
+    command = Command('brew install thefuck', output)
+    assert match(command)
+
+
+@pytest.mark.parametrize('script', [
+    'brew reinstall thefuck',
+    'brew install foo'])
+def test_not_match(script):
+    assert not match(Command(script, ''))
+
+
+@pytest.mark.parametrize('script, formula, ', [
+    ('brew install foo', 'foo'),
+    ('brew install bar zap', 'bar zap')])
+def test_get_new_command(script, formula):
+    command = Command(script, output)
+    new_command = 'brew reinstall {}'.format(formula)
+    assert get_new_command(command) == new_command