basho/rebar — pull request #382 by evax (2013-09-18 09:06:10+00:00)
Title: Support conditional template instructions

The form is either
```erlang
{'if', ConditionVariable :: atom(), InstructionsIfTrue :: list() | tuple()}.
```
or
```erlang
{'if', ConditionVariable :: atom(), InstructionsIfTrue :: list() | tuple(), InstructionsIfFalse :: list() | tuple()}.
```