Clark

Results 2 issues of Clark

When i refresh the line chart with less mAxis.mEntries ,the Xaxis item index was wrong . ![a3f5205c-7e3a-44c2-a666-f2c108dd0bfb](https://cloud.githubusercontent.com/assets/12440588/20883237/06d68c6e-bb20-11e6-983b-46158d36307f.png) if (mAxis.mEntries.length > n) ,there not new float[] .

### The language of WCDB > e.g. Objective-C, Swift or Java ### The version of WCDB > e.g. v1.0.5 ### The platform of WCDB > e.g. iOS, macOS or Android...