Field class inconsistencies

[cameronk]

For the sake of coding additional fields in the future, Field JSX classes should be consistent in implementation of properties such as componentWillMount and componentWillReceiveProps.

• Add setValue function to handle transition between different states
• setValue should determine validity based on passed props object
• Move console.* functions to after initial variable declarations in each function
• Variable declarations with undefined values should proceed those with defined values.
• Reorganize method in this order: getInitialState, componentWillMount, componentWillReceiveProps, setValue, onXChange, [other functions], render
• getInitialState should return value as an empty string instead of null when the field is empty (unless otherwise required by the component)
• State values like status, display, and displayState should be condensed to one or two consistently-utilized terms
• Use block comments for information instead of //