Merge pull request #41 from olleolleolle/patch-1

Gemspec: drop rubyforge_project setting
diff --git a/rakelib/release.rake b/rakelib/release.rake
index a4073d4..8370cf8 100644
--- a/rakelib/release.rake
+++ b/rakelib/release.rake
@@ -13,7 +13,7 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-RC_VERSION = ENV['RC_VERSION'] || ''
+RC_VERSION = ENV['RC_VERSION'] || '' unless defined?(RC_VERSION)
 
 desc 'Release the next version of buildr from existing staged repository'
 task 'release' do
diff --git a/rakelib/stage.rake b/rakelib/stage.rake
index 1c22693..06cd526 100644
--- a/rakelib/stage.rake
+++ b/rakelib/stage.rake
@@ -18,8 +18,8 @@
 
 gpg_cmd = 'gpg2'
 
-STAGE_DATE = ENV['STAGE_DATE'] ||  Time.now.strftime('%Y-%m-%d')
-RC_VERSION = ENV['RC_VERSION'] || ''
+STAGE_DATE = ENV['STAGE_DATE'] ||  Time.now.strftime('%Y-%m-%d') unless defined?(STAGE_DATE)
+RC_VERSION = ENV['RC_VERSION'] || '' unless defined?(RC_VERSION)
 
 task 'prepare' do
   # Update source files to next release number.