(refactor) updates to compiler and parser
(doc) added commenting for parser
(doc) added developer comments to compiler
Merge pull request #98 from jangahroo/master

(doc) added developer comments for parser and compiler
Adding memstream.rs to implement a custom memstream struct
Implemented MemStream with tests
Exported memstream to a crate that is now a rustache dependency
Fixed some typos in rustache.rs
Fixing merge conflicts