Mustache Features needed

[cmdematos]

Some missing features that we need to be able to pass using the CLI

• --ignore-undefined - if {{ FOO }} has no definition then do not replace {{ FOO }} with "", which is equating nothing with something. This is akin to equating null with "" which has unwanted side-effects. A particular execution of the mustache-cli may not be the final step in processing the file.

• --delimiter=XX,YY - use XX as start of tag delimiter instead of {{, yes YY as end of tag delimiter instead of }}. Typical usage .. --delimiter=@,@ replaced @FOO@ instead of {{ FOO }} with the value for FOO.