* snippets/ncl-mode/print.yasnippet: new snippet

Signed-off-by: Yakkala Yagnesh Raghava <hi@yagnesh.org>
* snippets/ncl-mode/do.yasnippet: enhance

Signed-off-by: Yakkala Yagnesh Raghava <hi@yagnesh.org>
* test/if_blocks.ncl: sample code

Signed-off-by: Yakkala Yagnesh Raghava <hi@yagnesh.org>