Escape curl braces in TextTransform

I'm trying to use TextTransform with an `nginx.conf` file.
The file contains braces `{`, and if I run the cake task with transformation I get the following error:

`Error: Input string was not in a correct format.`

I can escape the brace using a double character (`{{`), but then the output contains the same sequence (`{{`) instead of what I need (`{`).

I've found this closed issue: #380 but I think that it doesn't work in my case because of closing braces.

Example (working):

`var text = TransformText("{").ToString();`

Example (not working, throws the mentioned error):

`var text = TransformText("{something}").ToString();`

Start by locating the TextTransform implementation and the tests covering brace handling, then compare the working `TransformText("{")` case with the failing `TransformText("{something}")` case. Done means braces in transformed nginx.conf content produce single braces without the formatting error or doubled output.

Written by the indexing model from the issue text.