Added net.sf.xws4j

Needed for net.bioclipse.xws imports
Added test suite stuff for the QSAR feature
Updated the list of plugins: the test plugins, not the QSAR feature ones
Capitalized XMPP
Human readable feature name + 2.5.0 version number
Added a missing expected method to allow documentation checking
Updated the dependency.
Updated the dependency.
Removed versioning of dependencies.
Removed versioning of dependencies.
Added missing bundle org.openscience.cdk.valencycheck to required bundles
Merged master into 2.5.x
Cleaned up tests for new API, added TODOs
Removed .qualifier for chemoinformatics and rdf dependency

qualifier should only be used in feature/plugin version definition
"File > New… > Other" changed to "File > New… > QSAR" in step 1 of the
cheat sheet.
Made a clarification of where to find qsar.xml
Corrected the assignment (i.e. chanced '=' to '<-') and fixed a
misspelling.
Changed the title to "Getting started with Bioclipse-QSAR" (from the old
"Calculating CDK Properties")
Made a clarification about what's needed to view the R-console.
Changed the text so it reflects what happens.