Complete change notes
Fix bug in `import` documentation
Update README to reflect recent semantic changes
Add change notes and new version numbers
Test that circular imports work
Implement circular imports

Ensure that unfinished module namespaces are made known internally
before their source file is loaded, in order for incomplete imports due
to circular references to be found, rather than re-loaded.
Merge branch 'issue-17' into develop

Fix #17
Set encoding explicitly to UTF-8

Fix #19
Mark example as not run

Fix complaint of R CMD CHECK
Merge branch 'issue-19' into develop
Update change log
Merge branch 'develop'

Fix tons of issues
Update documentation