Added NONE to LegendPosition

Added NONE to LegendPosition, useful to hide Legend in certain cases
Merge pull request #170 from vicktor/master

Added NONE to LegendPosition
Added feature to enable/disable logging (issue #173). Added new legend position RIGHT_INSIDE (issue #172).
Added callbacks for fling gestures on the chart (OnChartGestureListener) (issue #165).
Added new .jar file.
Update README.md
Update Projects_using_MPAndroidChart.txt
Update README.md
Update Projects_using_MPAndroidChart.txt
Merge pull request #178 from androideveloper/patch-1

Update Projects_using_MPAndroidChart.txt
Fixed issue concerning XLabels crash (issue #176).
Fixed issue concering LineChart filling (#179). Made changes to the logic of filling and added FillFormatter interface for implementing a custom fill logic.
Merge readme and projects using lib.
Minor changes.
Replaced .jar file.
Minor fixes.
Minor changes.
Major changes to the architecture, introducing Transformer class.
Removed renderers, merged with experimental.
Minor improvements and changes to the arcitecture.