fix invalid syntax error
Merge pull request #61 from guitorri/fix_invalid_syntax

Thanks for that.
Extract building code from Dopri and Radau
Add regression test for user module code generation
Extract generating code to separate method
Add regression test for Dopri code generation

Check only the path, that differs
Add new regression tests
Prepare extraction of module generation code
Move method to code generator
Dopri uses new code generator method
Create mixin class for methods related to compilation
Clean code a lot
Add explicit list of exported symbols