Use configure_args rather than options

Replaced 'options' with 'configure_args'. That seems like a better name
and is consistent with the packaging guide.

var/spack/repos/builtin/packages/R/package.py

@@ -73,15 +73,15 @@ class R(Package):
 
     def install(self, spec, prefix):
         rlibdir = join_path(prefix, 'rlib')
-        options = ['--prefix=%s' % prefix,
+        configure_args = ['--prefix=%s' % prefix,
                           '--libdir=%s' % rlibdir,
                           '--enable-R-shlib',
                           '--enable-BLAS-shlib',
                           '--enable-R-framework=no']
         if '+external-lapack' in spec:
-            options.extend(['--with-blas', '--with-lapack'])
+            configure_args.extend(['--with-blas', '--with-lapack'])
 
-        configure(*options)
+        configure(*configure_args)
         make()
         make('install')