Created JSONUtils.java
Moved getJSON and getObject functions from FileUtils here
Changed case when the Other OsType is raised to do the same as Linux's

Split the updateListings function into 3 separate functions (for later implementation)

Store and retrieve the last modified time of the cloud spreadsheet (Bandwidth reasons.
* Change file id to Watchful1's
* Change API request to Watchful1's
Moved getJSON and getObject functions from FileUtils to JSONUtils