Force failed test to test appveyor compiler directive

Support references with Sheet1!A1:Sheet1!A50 style reference (sheet names)

Allow row ranges e.g. 1:5

Parse commas in print area (#263) ...

* add method to format the defined names if a comma exists in the sheet name

* add Excel workbook to test loading of sheets with commas in them (when they have a print area)

* Regex change to make sure all tests pass successfully

* use String.Format instead of new fangled string interpolation.

* Improve defined name parsing.

* Add unit test for references to a sheet with commas in the name

* Add unit tests and adjust CalcEngine to allow enclosing characters around identifiers

* Reformat code using CodeMaid

* Don't use C#6 syntax for dictionary initialiser.

Catch implicit conversion that fails. Fixes #117 .

Merge branch 'develop' of https://github.com/closedxml/closedxml into issue107-copy-formula ...

# Conflicts:
#	ClosedXML_Tests/Excel/Misc/FormulaTests.cs

Don't match parts of formula between single quotes (i.e. sheet names). Related to part of #90

Fix regex for parsing cell formula. Fixes #40. Fixes #107. Closes #41.

Project hierarchy cleanup