various fixes/improvements & make the code validate with JSHint

[pomeh]

I've made some changes on the base code to correct some bugs, to do some improvements, & to validate the code with JSHint tool.

Here is a list of modifications:

• removed trailling whitespace on end of lines,
• fixes global variables leaking (missing var keyword),
• allow coord function to get an object as first argument (shorter/cleaner call syntax),
• alternative syntax for arguments' default values in coord function (someVar = someVar || defaultValue),
• grouping variables declaration at the begining of the function,
• not running $(this) when inside a jQuery plugin (this is already a jQuery object),
• caching jQuery collections to variables,
• DRY code on the main for loop,
• caching array.length property on loop,
• faster DOM selections with jQuery (context.find(selector) instead of $(selector,context)),
• default option value for "align" option (+ removed "if" statements in for loop, use directly options.align value),
• pass JSHint test (unless "strict mode" option)

Tell me if you don't understand something.

Hope this will help !

Cheers,

Pomeh