Fix for multiple ranges in a row

Some row has two ranges in spans, for example:

```
<row ... spans="1:10 6802:6802">
```

This xlsx file causes following panic:

```
panic: Invalid range (not integer in upper bound) 1:10 6802:6802
```

Changes:

 * Call makeRowFromRaw instead of makeRowFromSpan
   when spans has 0 or 2 or more ":"