Fixed #152. JTwig equivalence evaluation is now loose, conforming to Twig's way of doing things.
Updated list comprehension behaviour to support operating on expressions per #78
Pursuant to #186, macro statements are now parsed correctly
Pursuant to #186, import statements are now parsed correctly
Pursuant to #186, initial working implementation of macro imports, excluding  operation
Pursuant to #186, initial implementation of from..import syntax.
The import name type-checking was causing build problems. Will fix, but reverting for now
Import now supports the _self keyword
Added a quick test for nested importing of _self
Refactored the Import-related classes and parsing rules to increase type-safety-ish-ness and enhance parsing-time error management.
Pursuant to #238, implementation of concatentation operator as a component of expressions. Should be applicable everywhere an expression is applicable.
Allow macros to use custom functions. Not happy with the courier anti-pattern, so we'll have to figure out a better way
Fixed a NPE issue during concatentation
Merge pull request #190 from thomas-p-wilson/fix-equivalency-checking

Fix for #152
Merge pull request #225 from thomas-p-wilson/fix-for-sequence-iteration

Updated list comprehension behaviour to support operating on expressions per #78
Merge pull request #239 from thomas-p-wilson/feature-concatenation

Concatenation implementation
Merge pull request #237 from thomas-p-wilson/feature-macros

Implement macro/import functionality