Play JAVA_OPTS

Previously the Play JAVA_OPTS mapping (adding a -J before all of them) didn't
work properly as it added a -J anywhere there was a -.  This change fixes that problem.

[resolves #460]

Author: nebhale

lib/java_buildpack/util/play/post22.rb

@@ -39,7 +39,7 @@ def augment_classpath
 
         # (see JavaBuildpack::Util::Play::Base#java_opts)
         def java_opts
-          '${JAVA_OPTS//-/-J-}'
+          '$(for I in $JAVA_OPTS ; do echo "-J$I" ; done)'
         end
 
         # (see JavaBuildpack::Util::Play::Base#lib_dir)

spec/java_buildpack/util/play/post22_spec.rb

@@ -47,7 +47,7 @@
 
     it 'returns command' do
       expect(play_app.release).to eq('test-var-2 test-var-1 PATH=$PWD/.test-java-home/bin:$PATH ' \
-      "#{java_home.as_env_var} exec $PWD/bin/play-application ${JAVA_OPTS//-/-J-}")
+      "#{java_home.as_env_var} exec $PWD/bin/play-application $(for I in $JAVA_OPTS ; do echo \"-J$I\" ; done)")
     end
 
     context do