Updated language files for Joomla 2.5

Language files will now be loaded for the admin backend.
Added backend menu icon
Added proper README
Lowered Joomla version requirement

Joomla 1.7 and Joomla 2.5 are now both OK to install on.
Added fallbacks for Platform 11.4 dependencies

JInput is not included with Joomla 1.7; added calls to JRequest.
Added meta keyword and description population
Fixed options scroll whiplash

Changed href to avoid instant scroll-to-top on advanced show/hide link
Updated category params and metadata

Set both to Joomla 2.5 defaults and added noindex, follow for meta
robots tag.
Added parent category option

Imported categories will be added as a child to the specified category
to ease transitions with new and changed categories on the feed.
Defaults to the root.
Increased manifest version number

Required to load database updates
README edits

Documented Parent Category and fixed typo.
Merge remote-tracking branch 'origin/j1.7-support' into dev-0.8
Merge pull request #4 from ContentLEAD/dev-0.8

Merging in dev changes for v0.8
Merge remote-tracking branch 'origin/master' into experimental