Update README.md
Return an error if a term is not defined
1.1.1
null and undefined placeholders return as empty string
1.1.2
Added base functions
1.2.0
Fixed bare parenthesis, need to fix pipes
1.2.1
Built files
Merge pull request #9 from KoryNunn/master

Latest
Merge pull request #10 from see-threepio/master

Updating gh pages