matcher: fixed status file, formatting, tweaks to readme

.status

Index: .status
diff --git a/.status b/.status
index 2c78d6737e948ded941b6d77fedb23e347f5b2a8..d5b57948a0cd8e24c77ee28b5d71b41bdd7b76a9 100644
--- a/.status
+++ b/.status
@@ -4,21 +4,11 @@
 
 # Skip non-test files ending with "_test".
 packages/*: Skip
-packages/*: Skip
-*/packages/*: Skip
-*/*/packages/*: Skip
-*/*/*/packages/*: Skip
-*/*/*/*packages/*: Skip
-*/*/*/*/*packages/*: Skip
-*/*/packages/*: Skip
-*/*/packages/*: Skip
 */packages/*: Skip
 */*/packages/*: Skip
 */*/*/packages/*: Skip
 */*/*/*packages/*: Skip
 */*/*/*/*packages/*: Skip
-*/*/*/*packages/*: Skip
-*/*/*/*/*packages/*: Skip
 
 # Only run tests from the build directory, since we don't care about the
 # difference between transformed an untransformed code.
@@ -34,4 +24,4 @@ test/*: Skip
 # The minified matcher tests test that the minified names of Dart types are
 # printed. Unminified versions of these tests exist that test the behavior when
 # not minified.
-matcher/test/*_minified_test: Skip # DO NOT COPY THIS UNLESS YOU WORK ON DART2JS
+*_minified_test: Skip # DO NOT COPY THIS UNLESS YOU WORK ON DART2JS