Update Resources.tt

Added tolerance for dots in Resource key, transformed to underscores in the generated C# file.
Ex : MyTextBlock.Text => MyTextBlock_Text
Update Resources.tt

Added tolerance for dots in Resource key, transformed to underscores in the generated C# file.
Ex : MyTextBlock.Text => MyTextBlock_Text
Merge pull request #1 from pleasereset/master

Compatibility with keys containing points