Will return _datetime_attributes if instance variable is nil anyways. If/Else statements can get messy if built out further, this statement better implies the intent. (+4 squashed commits)
Squashed commits:
[9e9c5de] Removes hidden whitespace from project files.
[43a51bf] No need to explicitly return here.
[a00af5f] Time format is repeated, might as well set as a constant.
[27eb9ea] Uses gemspec in Gemfile since time_jawn.gemspec is set up.