Add bindImage with full interface (fix #30)

Add access function for depth-stencil texture

make location_name_pairs in GLSLProgram const-ref

add vertex shader input type description to vertex layout

Fixed missing memory include for unique ptr

direct state access in all classes

fix missing depth attachment after fbo resize

Updated GLSLProgram class (removed two-stage intialization)

Merge branch 'master' of https://github.com/invor/glowl into HEAD

Added typename keyword to sizeof for template value types, cause gcc

complained