Tweak gradle generated eclipse meta-data

 - Change output folders to /bin/main and /bin/test. This prevents
   'gradle clean' from breaking eclipse.

 - Update copyright header for new files to '2002-2013'
Release version 3.2.1.RELEASE
Add BigDecimal support for SpEl numeric operations

Issue: SPR-9164

Prior to this change, SpEL supported numeric operations for int, float, ...
'new java.math.BigDecimal('0.1') > 0' evaluates to false
(BigDecimal is truncated to int)

This commit introduces support for BigDecimal operations
'new java.math.BigDecimal('0.1') > 0' evaluates to true
(the comparison is made with bigDecimals)