- go test and godoc has been updated

- Using the canonical syntax in issue template and contributing guide;
- go test has been updated

Added helper functions to set the chart size.

Signed-off-by: NEugene Dzhurinsky <jdevelop@gmail.com>

Added functions to set and get outline level for columns and rows.

Added helper functions to set the chart size.
Added the unit test
Signed-off-by: NEugene Dzhurinsky <jdevelop@gmail.com>

- Remove useless function `replaceWorkSheetsRelationshipsNameSpace()`;
- Make test cases use strict error checking

save bytes on memory instead of string

Added ZoomScale SheetViewOption

Add iterator method for rows

- godoc and go test has been updated

- go test and godoc has been updated

Accessible value between 10 - 400

Used as:
xlsx.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(75))

Accessible value between 10 - 400

Used as:
xlsx.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(75))

- go test and godoc has been updated

- Fix `checkCellInArea()` index out of range when merged cell ref is single coordinate, relate issue #206;
- go test updated;
- Repository icon for SourceTree has been added

- go test and godoc has been updated

- Add categories or values on reverse order (orientation of the chart) support, and set auto or fixed maximum, minimum of the axis, relate issue #202;
- go test and godoc has been updated

- Update the function `NewSheet()` to handle when already exists a worksheet of the same name, relate pull request #196;
- go test and godoc has been updated

- New function `SetSheetRow()` has been added for support write whole line at once, relate issue #96 and #194;
- go test and godoc updated;
- Note that this function performance has not been tested

- godoc and go test has been updated

- Update the function `AddChart()`: clustered, stacked and 100% stacked bar and column series charts supported, relate issue #190;
- go test and godoc has been updated

- go test and document has been updated.

- Fix ineffectual assignments in Go code;
- Godoc has been updated