Diagnose use of single quotes in attributes as an error
Bump version to 0.1.0 and update CHANGELOG
Revert "Bump version to 0.1.0 and update CHANGELOG"

This reverts commit 2a6858130c00bd299e36a92fd4a59f31fe4883f2.
Merge pull request #5 from rragan/master

Diagnose single quotes used to wrap an attribute value in tag. Without this, subtle errors are very hard to find. Makes it compatible with dust syntax.