v1.1.12

SimpleExpressions v1.1.12

Diff since v1.1.11

Merged pull requests:

• fix show bug (#69) (@jverzani)
• Exchange (#70) (@jverzani)
• Tuple (#71) (@jverzani)
• diff extensions, clean up combine (#72) (@jverzani)
• Combine (#73) (@jverzani)
• Tweaks (#74) (@jverzani)
• fix version (#75) (@jverzani)