Add 'skip nav' links to pages

Closes #337 

Had to disable search box `autofocus` to make 'skip nav' links to work. Investigating on how to enable search box `autofocus` back, 

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![image](https://cloud.githubusercontent.com/assets/302258/3505693/592294a4-0664-11e4-9133-fb7be4fdd5f3.png)
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![image](https://cloud.githubusercontent.com/assets/302258/3505698/7290e486-0664-11e4-8e23-d91e0895c208.png)
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![image](https://cloud.githubusercontent.com/assets/302258/3505703/85a6200e-0664-11e4-919d-4fb3d9a52f98.png)