Corrects playbook syntax with variables #296

Job	Run time
Test-Scripts (./test_aliases.sh)	1m 3s
Test-Scripts (./test_aliases.sh)	1m 3s
Test-Scripts (./test_aliases.sh)	1m 3s
Test-Scripts (./test_backtest.sh)	1m 8s
Test-Scripts (./test_backtest.sh)	20m 4s
Test-Scripts (./test_backtest.sh)	2m 2s
Test-Scripts (./test_bt_data_gen.sh)	1m 14s
Test-Scripts (./test_bt_data_gen.sh)	1m 14s
Test-Scripts (./test_bt_data_gen.sh)	1m 14s
Test-Scripts (./test_cmds.sh)	1m 14s
Test-Scripts (./test_cmds.sh)	1m 14s
Test-Scripts (./test_cmds.sh)	1m 14s
Test-Scripts (./test_compile.sh)	1m 13s
Test-Scripts (./test_compile.sh)	1m 13s
Test-Scripts (./test_compile.sh)	1m 13s
Test-Scripts (./test_eval.sh)	1m 10s
Test-Scripts (./test_eval.sh)	1m 10s
Test-Scripts (./test_eval.sh)	1m 10s
Test-Scripts (./test_vars.sh)	1m 4s
Test-Scripts (./test_vars.sh)	1m 4s
Test-Scripts (./test_vars.sh)	1m 4s
	44m 8s

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