Update hard-coded node 6.3.0 references

[#131987641]

Signed-off-by: James Wen <jrw2175@columbia.edu>

Author: Anna Thornton

cf_spec/unit/buildpack/compile/installers/bower_installer_spec.rb

@@ -30,12 +30,12 @@
   describe '#cached?' do
     context 'cache directory exists in the build directory' do
       before do
-        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'lib', 'node_modules', 'bower'))
+        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'lib', 'node_modules', 'bower'))
       end
 
       context 'cached version is the same as the current version being installed' do
         before do
-          File.open(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'lib', 'node_modules', 'bower', 'VERSION'), 'w') do |f|
+          File.open(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'lib', 'node_modules', 'bower', 'VERSION'), 'w') do |f|
             f.write '1.7.9'
           end
         end
@@ -47,7 +47,7 @@
 
       context 'cached version is different than the current version being installed' do
         before do
-          File.open(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'lib', 'node_modules', 'bower', 'VERSION'), 'w') do |f|
+          File.open(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'lib', 'node_modules', 'bower', 'VERSION'), 'w') do |f|
             f.write '1.0.0-preview1-002702'
           end
         end
@@ -68,9 +68,9 @@
   describe '#install' do
     context 'NPM is already installed' do
       before do
-        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'bin'))
-        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'lib', 'node_modules', 'bower'))
-        File.open(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'bin', 'bower'), 'w') { |a| a.write('a') }
+        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'bin'))
+        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'lib', 'node_modules', 'bower'))
+        File.open(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'bin', 'bower'), 'w') { |a| a.write('a') }
       end
 
       it 'downloads file with compile-extensions and writes a version file' do

cf_spec/unit/buildpack/compile/installers/nodejs_installer_spec.rb

@@ -30,7 +30,7 @@
   describe '#cached?' do
     context 'cache directory exists in the build directory' do
       before do
-        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.3.0-linux-x64', 'bin'))
+        FileUtils.mkdir_p(File.join(dir, '.node', 'node-v6.7.0-linux-x64', 'bin'))
       end
 
       it 'returns true' do

lib/buildpack/compile/installers/nodejs_installer.rb

@@ -23,7 +23,7 @@ class NodeJsInstaller < Installer
     BOWER_COMMAND = 'bower'.freeze
     CACHE_DIR = '.node'.freeze
     NPM_COMMAND = 'npm'.freeze
-    VERSION = '6.3.0'.freeze
+    VERSION = '6.7.0'.freeze
 
     def cache_dir
       CACHE_DIR