add test to use variable in where_exp condition
add test to use variable in where_exp condition

yhironaka/yhironaka.github.io,Strangehill/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,gencer/jekyll,gencer/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,ryanshaw/jekyll,x-way/jekyll,tomjohnson1492/jekyll,ryanshaw/jekyll,alex-kovac/jekyll,x-way/jekyll,ryanshaw/jekyll,fulldecent/jekyll,Strangehill/jekyll,getandpost/jekyll.github.io,fulldecent/jekyll,alex-kovac/jekyll,Strangehill/jekyll,jaybe-jekyll/jekyll,alex-kovac/jekyll,tomjohnson1492/jekyll,jaybe-jekyll/jekyll,alex-kovac/jekyll,gencer/jekyll,tillgrallert/jekyll,getandpost/jekyll.github.io,chrisfinazzo/jekyll,tomjohnson1492/jekyll,fulldecent/jekyll,getandpost/jekyll.github.io,tomjohnson1492/jekyll,gencer/jekyll,jekyll/jekyll,gencer/jekyll,chrisfinazzo/jekyll,x-way/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,x-way/jekyll,jekyll/jekyll,fulldecent/jekyll,tomjohnson1492/jekyll,Strangehill/jekyll,alex-kovac/jekyll,jekyll/jekyll,jekyll/jekyll