Default the image position to top left if position hasn't been set.

fix support for TIFF files

Fix dependency issue

Merge branch 'net40' into metadata-extractor

When setting culture, do it for every time a test is run.

Implement MetadataExtractor to get image dimensions and format

Merge branch 'netstandard2' into net40 ...

# Conflicts:
#	ClosedXML_Examples/ClosedXML_Examples.csproj
#	ClosedXML_Sandbox/ClosedXML_Sandbox.csproj

Update NuGet on appveyor before building

Try netstandard where possible

Replace net452 with net40 build

Use OpenXML 2.7.2 for all targets

Add a basic test for OpenXml - which currently breaks in .NET Standard 2.0

Merge remote-tracking branch 'origin/drop-dataTable-asEnumerable' into netstandard2 ...

# Conflicts:
#	ClosedXML/Excel/Cells/XLCell.cs

Improve color support and more

Add ability to insert data of datatable directly without converting to Enumerable - preparation for .NET Standard

Allow rename of sheet by changing case

Add APPVEYOR environment variable support

Change to VS 2017 Preview image to support .NET Standard 2

Merge branch 'develop' of https://github.com/ClosedXML/ClosedXML into netstandard2 ...

# Conflicts:
#	ClosedXML/ClosedXML.csproj
#	ClosedXML/Excel/Drawings/XLPicture.cs
#	ClosedXML/Excel/IXLTheme.cs
#	ClosedXML/Excel/XLWorkbook.cs
#	ClosedXML/Excel/XLWorkbook_Load.cs
#	ClosedXML/Excel/XLWorkbook_Save.cs
#	ClosedXML/Properties/AssemblyInfo.cs
#	ClosedXML/Utils/GraphicsUtils.cs
#	ClosedXML/XLHelper.cs
#	ClosedXML/packages.config
#	ClosedXML_Examples/ClosedXML_Examples.csproj
#	ClosedXML_Examples/Properties/AssemblyInfo.cs
#	ClosedXML_Examples/packages.config
#	ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
#	ClosedXML_Sandbox/Properties/AssemblyInfo.cs
#	ClosedXML_Sandbox/packages.config
#	ClosedXML_Tests/ClosedXML_Tests.csproj
#	ClosedXML_Tests/Properties/AssemblyInfo.cs
#	ClosedXML_Tests/packages.config

Implement .NET standard as far as possible. ...

System.Drawing.Bitmap is still missing - hence the XLPicture API is incomplete

Revert change that introduce bug in parsing shared fomulas

Allow duplicate picture names when loading a file, but don't allow duplicate Ids

Optimise calculation chain generation and introduce new SaveOptions

Add helper function: IXLCell.HasArrayFormula and improve loading of array formulas

Update test cases for array formulas

Merge pull request #442 from igitur/remove-IsNullOrWhiteSpace-net35-workaround ...

Remove obsolete XLHelper.IsNullOrWhiteSpace

Remove obsolete XLHelper.IsNullOrWhiteSpace

Allow ridiculous, but valid formulas, e.g. =+++++++MID(A3,3,5)

Allow minimum of 3 parameters for VLOOKUP / HLOOKUP

Default range lookup to true if parameter is EmptyValueExpression