move 'domready' trigger to onAdd() function

[gigmaps]

fixes #10:

• line 849 - move the 'domready' trigger from updateContent_() into the onAdd() function - so that the 'domready' event is fired after the infoBubble is appended to the map panes (& therefore) added to the DOM (or it's impossible to dynamically add / find the infoBubble after the 'domready' without using a setTimeout or other hack)
• minor code clean-up for consistency in spacing and line breaks

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