Add method  to twig extention
Merge pull request #36 from instabledesign/1.0

Add method  to twig extention
Added unit test for Twig extension can method
Merge branch '1.0' into feature-context-graph-aware
Added graph-aware context
Made twig extension graph-aware
Merge pull request #37 from yohang/feature-context-graph-aware

[WIP] Made Finite\Context graph aware