Gruntfile.js: ' --> "
tasks/set_app_mode.js --> tasks/grunt_set_app_mode.js
SetAppModeConfig unit tests
test/end_to_end_test.js: tasks/set_app_mode.js --> tasks/grunt_set_app_mode.js
SetAppModeConfig - initial working version, along with fixed unit tests; added underscore to devDependencies
{mode,other}.{bronze,silver,gold}.js added - second test of test src files
SetAppModeExecutor unit tests - NB to be tested