Simplify release (milestone or GA) process

We could work on improving the publishing process for milestones or GA. Some ideas:

• Why do we rename the files we pull on sf.net. Also, renaming files could happen on sf.net.
• Files from sf.net could be fetch after (for example in parallel with creating marketplace entry)
• webtools should be published in a similar way as other parts (moved to tools/static/releases and then referenced in the composite file)
• Replace the .core, .webtools, .hibernatetools, .coretests suffix by actual URL segments, so one would only have to move a single folder instead of 4 ones.
• Identify things that can be done in parallel.
• ...