add basic structure for context class
add basic structure for context class

ShiweiJuliaHuang/plustache,kylealanhale/plustache,kylealanhale/plustache,chesles/plustache,ShiweiJuliaHuang/plustache,cgcgbcbc/plustache,chesles/plustache,thecocce/plustache,chesles/plustache,ShiweiJuliaHuang/plustache,mrtazz/plustache,kylealanhale/plustache,cgcgbcbc/plustache,thecocce/plustache,mrtazz/plustache,cgcgbcbc/plustache,thecocce/plustache