Added JSON Ajax feed type, random feed order and general improvements

[Umaroth]

New options:

• feedType: 'json'
• jsonType: 'array', 'object'
• jsonObjKey: string matching which key you want to return from the object
• order: 'sequential', 'random'
• offset: number of pixels, default is 20

jsonType only must be set if feedType == 'json' jsonObjKey only must be set if jsonType == 'object'

General code improvements:

• Changed deprecated .live() function to .on()
• Replaced implicit variable declarations with explicit ones
• Removed unnecessary semicolons
• Uniformly converted preceding spaces into tabs
• Removed following empty space
• Changed all comparisons to strict
• Fixed broken comparison
• Added error callbacks to ajax calls