added "show values" to bar chart

Conflicts:
	EazeGraphLibrary/src/main/java/org/eazegraph/lib/charts/BarChart.java
	EazeGraphLibrary/src/main/java/org/eazegraph/lib/charts/BaseChart.java
resolved conflict
canvas renamed to _Canvas
added performClick in onTouchEvent
replaced ACTION_UP with ACTION_DOWN
added public update() method
Merge pull request #14 from j4velin/showValues

Added mShowValues attribute which determines if the value of each data should be drawn in the graph
Merge pull request #17 from j4velin/performclick

added performClick in onTouchEvent
Merge pull request #18 from j4velin/update

added public update() method
Merge branch 'master' of https://github.com/blackfizz/EazeGraph into getdata

Conflicts:
	EazeGraphLibrary/src/main/java/org/eazegraph/lib/charts/BaseChart.java