simplify inconsistencies w/ JBT and JBDS build/update site URLs

Spoke with Max today and we've decided to simplify the collection of URLs a little. Thus, here's the new structure for development milestones.

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== JBT development milestones (3.2.1.M1, 3.3.0.M1) ==

=== Updates ===

http://download.jboss.org/jbosstools/updates/stable/helios/ (still 3.2.0.GA, as 3.2.1.M1 is an "unofficial release" at this point; UNCHANGED)

http://download.jboss.org/jbosstools/updates/development/? (new landing page, does NOT redirect to /stable/helios/)

http://download.jboss.org/jbosstools/updates/development/helios/ (3.2.1.M1, unofficial release)

http://download.jboss.org/jbosstools/updates/development/indigo/ (3.3.0.M1 - once vetted, this will be linked from www.jboss.org/tools site & pushed to sourceforge later this week)

=== Builds ===

See subfolders of these:

http://download.jboss.org/jbosstools/builds/stable/ (previous GAs; was /release/ but now renamed for consistency)
http://download.jboss.org/jbosstools/builds/development/ (milestones)

== JBDS development milestones (4.1.0.M1) ==

=== Updates ===

See subfolders of these:

http://www.qa.jboss.com/binaries/RHDS/updates/stable/ (previous GAs; UNCHANGED)
http://www.qa.jboss.com/binaries/RHDS/updates/development/ (milestones)

=== Builds ===

See subfolders of these:

http://www.qa.jboss.com/binaries/RHDS/builds/stable/ (previous GAs; UNCHANGED)
http://www.qa.jboss.com/binaries/RHDS/builds/development/ (milestones)