Fix a bug that the default value of --po-dir isn't expanded
Merge pull request #670 from kou/fix-missing-expression-expansion

Fix a bug that the default value of --po-dir isn't expanded
Refactor a test
Don't escape fix_typewriter results. RDoc does this.

Fixes #667
Ensure doc links are downcased
Fix test that broke in 1.8.7
Ensure last list element is clickable
Properly link toplevel in yard server
Properly filter visibilities in yard graph

Fixes #662
Add title tags to class/method list pages
Fix broken spec in 2.0
Bump to version 0.8.6.2
Setup object on overload inner tags
Add 'Returns' prefix to summary contents of a @return tag
Update Gemfile
Fix @!visibility to work on future methods
Fix failures in last commit. Visibility only works in 1.9.x
Strip newlines in summary to fix formatting issues

Fixes #686
Visibility macro does not modify future methods in legacy mode
Don't copy reftags twice

Fixes #678