pgtap 0.91.0

- Upgrade to 0.91.0
- Change the skip clean to 'share' to stop a warning.
- The `skip_clean` is needed. It installs nothing to its prefix.
- Change the `satisfied?` PGS test to whether HB PGS is installed.
- Prepend HB PSG bin to PATH so it finds the right pg-config

Closes Homebrew/homebrew#15474.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/pgtap.rb

@@ -12,7 +12,7 @@ class PostgresqlInstalled < Requirement
     EOS
   end
   def satisfied?
-    which 'pg_config'
+    Formula.factory('postgresql').installed?
   end
   def fatal?
     true
@@ -20,16 +20,16 @@ class PostgresqlInstalled < Requirement
 end
 
 class Pgtap < Formula
-  url 'http://pgfoundry.org/frs/download.php/2701/pgtap-0.24.tar.bz2'
   homepage 'http://pgtap.org'
-  sha1 '8a23fe62e1e476731076a588cb628fe9f1a028b1'
+  url 'http://api.pgxn.org/dist/pgtap/0.91.0/pgtap-0.91.0.zip'
+  sha1 '1f10b78eb42361659603228c754a55755fcff4fa'
 
   depends_on PostgresqlInstalled.new
 
-  skip_clean :all
+  skip_clean 'share'
 
   def install
+    ENV.prepend 'PATH', Formula.factory('postgresql').bin, ':'
     system "make install"
-    bin.install %w(bbin/pg_prove bbin/pg_tapgen)
   end
 end