Commits on May 9, 2019

1. Improve YAML spec conformance by three tests …

   * Relax the verison checks to support 1.1 to 1.3 range.
     * Fix up emitter to use version from `DocumentStart` object instead
       of constant.
   * Add YAML 1.2 escape character '/'
     * This was the only difference in escaped sequence between 1.1 and
       1.2: https://yaml.org/spec/1.1/#id872840 and
       https://yaml.org/spec/1.2/spec.html#id2776092
   * Improve grammar in SyntaxErrorException: `find` -> `found` to match
     with the counter part `did not find` (used in other cases).
   * Improve formatting of failing test error message in SpecTests.
     * <details>
       <summary>Sample failure:</summary>
   
       ```
       Test Name:	YamlDotNet.Test.Spec.SpecTests.ConformsWithYamlSpec(name: "4ABK", description: "Spec Example 7.17. Flow Mapping Separate Values", inputFile: "C:\\Users\\adeel\\Source\\Repos\\yamldotnet\\YamlD"..., expectedEventFile: "C:\\Users\\adeel\\Source\\Repos\\yamldotnet\\YamlD"..., error: False)
       Test FullName:	YamlDotNet.Test.Spec.SpecTests.ConformsWithYamlSpec (04719e7467f756f24522681db96dacf88dbb3cd7)
       Test Source:	C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet.Test\Spec\SpecTests.cs : line 51
       Test Outcome:	Failed
       Test Duration:	0:00:00.332
   
       Result StackTrace:	at YamlDotNet.Test.Spec.SpecTests.ConformsWithYamlSpec(String name, String description, String inputFile, String expectedEventFile, Boolean error) in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet.Test\Spec\SpecTests.cs:line 65
       Result Message:
       Unexpected spec failure.
       Expected:
       +STR
       +DOC
       +MAP
       =VAL :unquoted
       =VAL "separate
       =VAL :http://foo.com
       =VAL :
       =VAL :omitted value
       =VAL :
       =VAL :
       =VAL :omitted key
       -MAP
       -DOC
       -STR
   
       Actual:
       [Writer Output]
       +STR
       +DOC
       +MAP
       =VAL :unquoted
       =VAL "separate
   
       [Exception]
       YamlDotNet.Core.SyntaxErrorException: (Line: 3, Col: 1, Idx: 27) - (Line: 3, Col: 5, Idx: 31): While scanning a plain scalar, found unexpected ':'.
       at YamlDotNet.Core.Scanner.ScanPlainScalar() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Scanner.cs:line 1867
       at YamlDotNet.Core.Scanner.FetchPlainScalar() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Scanner.cs:line 1817
       at YamlDotNet.Core.Scanner.FetchNextToken() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Scanner.cs:line 480
       at YamlDotNet.Core.Scanner.FetchMoreTokens() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Scanner.cs:line 213
       at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Scanner.cs:line 127
       at YamlDotNet.Core.Parser.GetCurrentToken() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Parser.cs:line 51
       at YamlDotNet.Core.Parser.ParseFlowMappingKey(Boolean isFirst) in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Parser.cs:line 896
       at YamlDotNet.Core.Parser.StateMachine() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Parser.cs:line 187
       at YamlDotNet.Core.Parser.MoveNext() in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet\Core\Parser.cs:line 115
       at YamlDotNet.Test.Spec.SpecTests.ConvertToLibYamlStyleAnnotatedEventStream(TextReader textReader, TextWriter textWriter) in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet.Test\Spec\SpecTests.cs:line 96
       at YamlDotNet.Test.Spec.SpecTests.ConformsWithYamlSpec(String name, String description, String inputFile, String expectedEventFile, Boolean error) in C:\Users\adeel\Source\Repos\yamldotnet\YamlDotNet.Test\Spec\SpecTests.cs:line 60
       Expected: True
       Actual:   False
       ```
       </details>
   
   Fixes specs:
   
   * [UDM2](https://github.com/yaml/yaml-test-suite/tree/data/UDM2) (Plain URL in flow mapping)
   * [3UYS](https://github.com/yaml/yaml-test-suite/tree/data/3UYS) (Escaped slash in double quotes)
   * [5MUD](https://github.com/yaml/yaml-test-suite/tree/data/5MUD) (Colon and adjacent value on next line)
   
   Contributes to: aaubry#398

   

   am11 committed May 9, 2019
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