Fixed for negative numbers and doubles and empty array

This release fixes line chart crashing on negative numbers, also fixes a crash when you start with an empty array and fill up later

New full screen chartview

Added new fullscreen chartview
added the option to turn off drop shadow for LineChartView, BarChartView, PieChartView

1.2.0-beta

New features:

• Line chart
• Bar chart
• Interactive charts, drag to reveal data points
• New styling
• Easier to custom style charts (only for bar chart yet)