Added support for bar labels

Added support for showing labels(the data value) on top of the bars. By
default, this is false, and enabling this via "options" will bring the
bar labels to the chart.
Updated Readme to have sample code of the change

Updated Readme to have sample code of the change ( Bar labels)
Fixed a typo in readme

Fixed a typo in readme
Fixed an label cropped (For tallest bar) issue

Fixed an label cropped (For tallest bar) issue from bar chart-labels
fixed a label cropping issue

Fixed an issue with bar labels being cropped on the bar chart.
fixed the label cropping issue

fixed the label cropping issue by adding one extra step in the graph so
that the label will fit there.
Merge pull request #1 from kshyju/master

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