[PLT-367] Update WRT changes in OG-Platform

com.opengamma.language.context.GlobalContext
  .getMarketDataSnapshotSource()

now returns type NamedSnapshot
instead of StructuredMarketDataSnapshot
add repository and update tools version
add root dir definition to avoid compile error
do not scan on non win32 if java path is "."

This removes the recursive directory scan if the java path is "." on
non-win systems.  Since the current directory is the root directory
this causes a massive scan which freezes the system.
disable og-rstat jar creation
add 2.0.0-RC1