Add DynamicVarBrace Transformer for properly handling ${$foo} syntax
bug #798 Add DynamicVarBrace Transformer for properly handling ${$foo} syntax (keradus)

This PR was squashed before being merged into the 1.3-dev branch (closes #798).

Discussion
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Add DynamicVarBrace Transformer for properly handling ${$foo} syntax

Add DynamicVarBrace Transformer for properly handling ${$foo} syntax.

Resolves #795

Commits
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4b1bec4 Add DynamicVarBrace Transformer for properly handling ${$foo} syntax