Add releng component for building with buckminster

This enables mirroring of the p2.site using p2 actions from buckminster
This file also contians extra dependencies needed to build the bundles in this repo
Adds equinox security and swt fragments
Cleans up dependencies

Removes extension of AbstractUIPlugin
and changes most require bundle to import package
Added org.eclpse.ui to platform
Looks at org.eclipse.ui/defaultPerspectiveId when getting initial window
perspective
Adds logging and a fall back to System.getProperty for default
perspective
Updates bundle versions to 2.6.1
Feature version set to 2.6.1
Update version of walware feature in target platform
Fix version number for 2.6.1
Changes the description from "[...] for refseq)." to "[...] for
refseqn)."
Merge pull request #45 from bioclipse/Bug3545

Changes the description in the EBIWSDbfetchWizardPage
Ignore manager if it can not be retrieved

Makes jsexecution fail gracefully when a manager is not available by logging and error and continue
Updates cdk and logging to the latest versions

Updated log back to 1.0.13 and slf4j to 1.5.11
Say something about an exception thrown, because the method returns neither true nor false in whatever condition
Fix target platform
Fixed the exception message: adding missing spaces, and more user oriented
Merge pull request #46 from egonw/bugs/fixMethodDescription

Bugs/fix method description
Merge pull request #47 from egonw/bugs/fixedFailMessage

Bugs/fixed fail message
Adds url to platform feature