Strict mode over operations and variables
Based on the discussion around #112, made Jtwig behave exactly like twig (replicated the PHP's loose evaluation behaviour for comparison's only).
Fixed broken tests
Moved some tests to it's proper location (unit tests). Added some more tests about untested jtwig-spring behaviour (just mincing around)
Fixed the selection operation behaviour.
Fixed the selection operation behaviour.
Fixed value list behaviour and also did some tidy up on variable extract method based on the new contract.
Merge pull request #126 from lyncodev/issue-112

Strict mode over operations and variables