Issue with line breaking about fortune-sheet

[shuanhukexuejia]

Thanks for your report, I'm working on it now

[shuanhukexuejia]

Has been fixed, see #83

[SuyongSun]

Some issues complement:

1. Alignment is correct, but there is a extra blank row below the last row, so it can not be stay in center when style is vertical centralized.
   

2. And when editing the cell, if needing to add new breaking row, input a "alt+enter" there will be two row generated. This support the above issue, though the original issue fixed, but extra blank row staying.
   

[shuanhukexuejia]

Sorry for that, its our negligence, see #87

[SuyongSun]

Take it easy. You have done a nice job.

[SuyongSun]

Sorry, one more thing.
The style has been fixed, but there is a minor falt with the RC cell value still have a extra "\r\n" in the end of value.
For example, we have a cell with value "test", we input "alt + enter" to add a new row then delete it, the value is expected still be "test", but the value is actually "test\r\n" in the data object. It will be impact other relation styles, such as export to excel, the cell is still with a extra blank row and the cell style is something wrong with this.

[shuanhukexuejia]

You are right, have updated it.

[SuyongSun]

You are right, have updated it.

Thanks, got the fixed.