Update README.md
Join on external field features add. Needed if two tables need to be joined, none of them beeing  the tabel of the active record.
Bugfix, error should not be thrown here. $end can be smaller than $start
Several changes in views of AR
Merge branch 'master' of https://github.com/Amstutz/ActiveRecord
Merge pull request #1 from Amstutz/master

Several view changes, Join on external field, Bugfix Limit
Merge dev to master and resolve some conflicts