Parse if then else
Merge pull request #2 from lethalman/ifthenelse

Parse if then else
Merge pull request #1 from lethalman/master

Fix parsing of rec sets with reserved keyword
Normalize recent changes to fit the overall design
Add support for more operators
Add a reserved words as "stop words" for nixApp
Several more minor fixes
if/then/else is working, next to do is "inherit"
Add the NInherit type
Use a type to express rec sets instead of a bool