Correcting Axis Labels

Squashed commit of the following:

commit bc9a0cf528d49bff166e091676058d08de604f15
Author: Arafatk <[email protected]>
Date:   Mon Mar 14 09:37:37 2016 +0530

    correcting axis labels

commit 9d20633
Author: Arafat <[email protected]>
Date:   Sun Mar 13 19:25:59 2016 +0530

    Update Visualizing data with daru DataFrame.ipynb

Author: Arafatk