Merge branch 'features/postgresql' into develop

- add spack cd command.
- Fix bug in modules hook

Conflicts:
	lib/spack/spack/cmd/stage.py
	lib/spack/spack/hooks/dotkit.py
	share/spack/setup-env.bash

var/spack/packages/openssl/package.py

@@ -0,0 +1,26 @@
+from spack import *
+
+class Openssl(Package):
+    """The OpenSSL Project is a collaborative effort to develop a
+       robust, commercial-grade, full-featured, and Open Source
+       toolkit implementing the Secure Sockets Layer (SSL v2/v3) and
+       Transport Layer Security (TLS v1) protocols as well as a
+       full-strength general purpose cryptography library."""
+    homepage = "http://www.openssl.org"
+    url      = "http://www.openssl.org/source/openssl-1.0.1h.tar.gz"
+
+    version('1.0.1h', '8d6d684a9430d5cc98a62a5d8fbda8cf')
+
+    depends_on("zlib")
+    parallel = False
+
+    def install(self, spec, prefix):
+        config = Executable("./config")
+        config("--prefix=%s" % prefix,
+               "--openssldir=%s/etc/openssl" % prefix,
+               "zlib",
+               "no-krb5",
+               "shared")
+
+        make()
+        make("install")

var/spack/packages/postgresql/package.py

@@ -0,0 +1,20 @@
+from spack import *
+
+class Postgresql(Package):
+    """PostgreSQL is a powerful, open source object-relational
+       database system. It has more than 15 years of active
+       development and a proven architecture that has earned it a
+       strong reputation for reliability, data integrity, and
+       correctness."""
+    homepage = "http://www.postgresql.org/"
+    url      = "http://ftp.postgresql.org/pub/source/v9.3.4/postgresql-9.3.4.tar.bz2"
+
+    version('9.3.4', 'd0a41f54c377b2d2fab4a003b0dac762')
+
+    depends_on("openssl")
+
+    def install(self, spec, prefix):
+        configure("--prefix=%s" % prefix,
+                  "--with-openssl")
+        make()
+        make("install")

var/spack/packages/tau/package.py

@@ -12,7 +12,6 @@ class Tau(Package):
 
     version('2.23.1', '6593b47ae1e7a838e632652f0426fe72')
 
-
     def install(self, spec, prefix):
         # TAU isn't happy with directories that have '@' in the path.  Sigh.
         change_sed_delimiter('@', ';', 'configure')