Remove private indent
Completely rewrite and simplify the codebase

* Both image and convert are now Convert class
* Blocks evaluate right away (allows assigning a var used inside block)
* Sugar functions are reorganized and their implementations simplifed
* Chain support and numerous aliases are removed
Rename save to write
Fix test class names
Update README to match changes in the rewrite
Fix some remaining tests
Update CHANGELOG
Bump version 0.1.1 => 0.2.0