Added Environment Modules package.

var/spack/repos/builtin/packages/environment-modules/package.py

+from spack import *
+
+
+class EnvironmentModules(Package):
+    """Environment Modules for HPC"""
+
+    homepage = "https://sourceforge.net/p/modules/wiki/Home/"
+    url      = "http://prdownloads.sourceforge.net/modules/modules-3.2.10.tar.gz"
+
+    version('3.2.10', '8b097fdcb90c514d7540bb55a3cb90fb')
+
+    # Dependencies:
+    depends_on('tcl')
+
+    def install(self, spec, prefix):
+        # See: https://sourceforge.net/p/modules/bugs/62/
+        CPPFLAGS = ['-DUSE_INTERP_ERRORLINE']
+        config_args = [
+            "--prefix=%s" % prefix,
+            "--with-tcl=%s" % join_path(spec['tcl'].prefix, 'lib'),    # It looks for tclConfig.sh
+            'CPPFLAGS=%s' % ' '.join(CPPFLAGS)
+        ]
+
+
+        configure(*config_args)
+        make()
+        make("install")