update developer version to gradle 2.0 RC2
gradle 2.0-rc-2 (devel)
gradle 2.0-rc-2 (devel)

Closes #30564.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Revert "update developer version to gradle 2.0 RC2"

This reverts commit 316a706eea587243d1dac7eb31fc336e664b048f.