Change async loading of template and tar file

[Kevin-Velasquez]

Loading of template is done in 'client/src/components/GeneratorApp/GeneratorApp.js' lines 59-69.
Loading of tar is done in 'client/src/components/GeneratorApp/Header/GeneratorAppHeader.js' lines 77-82.

Current implementation, due to time constraints, was to use a setTimeout() before attempting to retrieve data from the node.js server in server.js. This is an issue due to not being fault tolerant. ie. a slow connection might create a situation where the data isn't ready to be retrieved after the setTimeout() has expired or a large template generation might take longer, hence not be ready to be retrieved in time.

Methods to try:
Redux connect()
Redux subscribe()
Using Promises to wait until state changes