add couple delegate methods. trying to match methods to user stories
set up background of graph
draw x and y axes
renamed delegate methods to mimic Jawbone
add gridlines
add switch button for gridlines
put gridlines in array and display the array instead of display gridline one by one
create axesView and add gridlines as subLayers to axes view
Merge pull request #3 from omarshaik/experimental/john/tryMakeLineGraph

Experimental/john/try make line graph