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add datavalidation test and fixed struct bug issue #240

# fix : file close 没有关闭

Fixes #256 and format document.

data validation funcation

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Merge pull request #253 from alex-whitney/252-color-scale-cond-formatting

Use min/mid/max value for 2 and 3 color scale conditional formatting

Use min/mid/max value for 2 and 3 color scale conditional formatting

Add failing unit tests for issue-252

Bugfix: create worksheet cause file issue. Relate issue #249.

GoDoc updated.

Merge pull request #246 from nad2000/retrieve-comments

added retrieval of worksheet comments

- Initialize theme support;
- RGBA, HSL color convert has been added;
- go test updated

added unit tests

added retieval of worksheet comments

- Update Travis CI to include GOARCH=386 tests, relate issue #239 and #244;
- Fix doc typo

Merge pull request #234 from dolmen-go/WriteTo

Extract WriteTo method (see io.WriterTo) to expose bytes written

Merge pull request #241 from nad2000/issues/238

improved comment formatting

Update comment.go

make the comment box's height auto and having the minimum height.

Merge pull request #243 from liepumartins/patch-2

Restore date 32bit compatibility

Restore date 32bit compatibility, be more verbose

Do not use large int64 constants that are not available in GOARCH=386
Fix #239

improved commenting formatting

Merge pull request #237 from liepumartins/patch-1

Ability to parse dates further in future

Ability to parse dates further in future

Golangs time.Duration uses nanoseconds, thus it is limited to approximately 290 years.

Merge pull request #155 from dolmen-go/deepcopy-with-reflect

CopySheet() using reflect instead of encoding/gob

CopySheet() using reflect instead of encoding/gob

Use github.com/mohae/deepcopy to deep copy worksheets instead of the
internal deepcopy function that was using encoding/gob serialization and
deserialization.

Rationale:
1/ using `encoding/gob` is much slower than
[`mohae/deepcopy`](https://github.com/mohae/deepcopy/)
2/ When building an application this implementation of `deepcopy` drags
the `encoding/gob` package into the binary. And this package is much
bigger than `mohae/deepcopy` (which only depends on `time` and `reflect`).

```
$ LC_ALL=C stat -f "%6z %N" $(go env GOPATH)/pkg/$(go env GOOS)_$(go env GOARCH)/github.com/mohae/deepcopy.a $(go env GOROOT)/pkg/$(go env GOOS)_$(go env GOARCH)/encoding/gob.a
10508 .../pkg/darwin_amd64/github.com/mohae/deepcopy.a
541818 .../pkg/darwin_amd64/encoding/gob.a
```

Extract WriteTo method (see io.WriterTo) to expose bytes written

Extract a WriteTo() method (see io.WriterTo) that exposes the count of bytes
written and rewrite Write() to use it.

Documentation:
* Add information about return value of NewSheet()
* Minor documentation language fixes
Samples:
* Added sample go file for dumping a XLSX file to the console

- Add error return value for functions: `AddChart()`, `AddComment()`, `AddPicture()`, `AddShape()`, `AddTable()` and `SetConditionalFormat()`
- go test has been updated