Context aware redirect

Make 301 redirects context aware. Aliases are unique to contexts
Revert "Context aware redirect"

This reverts commit 210ace3804e525d3426dcd634a87d33fba648909.
Context aware 301 Redirects

Make 301 redirects context aware, as page aliases are unique per context
(and not globally unique) on multidomain setups
Add system settings

Load plugin defaults from system settings and make context-aware-alias
configurable aswell
Ooops

Remove unnecessary echo
Stupid typo

How did that happen?
Added Settings to lexicon (de and en)

Added Settings to german and english lexicon
One more typo

Sorry
Fix settings

Fix loading defaults from settings. Used incorrect settings names and
the lexicon entries for the settings have been incorrectly labeled
Fix context check for add old URL
Merge pull request #28 from Serophos/master

Get defaults from modx settings. Add Context aware redirects