fix removeRow

[xiaweiss]

commit 1: fix removeRow mistake: (row < map.width) -> (row < map.height)

Before delete row

After delete row

this condition is checked merged cell in next line, so it should be row < map.height
when we fixed it：

commit 2: fix removeRow when skips columns when adjusting rowspan

when skip col，we get next col，but index not update, map.map[index] and map.positionAt(row, col, table) is not the same cell
see issue #136

[xiaweiss]

@marijnh

[marijnh]

This repository is not currently being maintained. If you want to set up (and maintain) a fork, or ask the current owners if they'll let you take over, that might work. But I don't currently have time to review PRs on this.