Project#envvar method naming fix

* Fix from plural envvar to envvars for consistency with API endpoint
* Preserve old functionality

lib/circleci/project.rb

@@ -102,10 +102,19 @@ def self.enable(username, project)
     # @param project  [String] - Name of project
     # @return         [CircleCi::Response] - Response object
 
-    def self.envvars(username, project)
+    def self.envvar(username, project)
       CircleCi.http.get "/project/#{username}/#{project}/envvar"
     end
 
+    ##
+    #
+    # @deprecated Please use [CircleCi::Project#envvar]
+    def self.envvars(username, project)
+      logger = Logger.new(STDOUT)
+      logger.warn('[Deprecated] Project#envvars is deprecated please use Project#envvar')
+      envvar username, project
+    end
+
     ##
     #
     # Sets an envvar for a project

spec/circleci/project_spec.rb

@@ -402,9 +402,9 @@
     end
   end
 
-  describe 'envvars' do
+  describe 'envvar' do
     context 'successfully', vcr: { cassette_name: 'project/envvar/success', record: :none } do
-      let(:res) { CircleCi::Project.envvars 'mtchavez', 'circleci' }
+      let(:res) { CircleCi::Project.envvar 'mtchavez', 'circleci' }
 
       it 'returns a response object' do
         res.should be_an_instance_of(CircleCi::Response)
@@ -420,7 +420,7 @@
     end
 
     context 'unsuccessfully', vcr: { cassette_name: 'project/envvar/unsuccessfully', record: :none } do
-      let(:res) { CircleCi::Project.envvars 'mtchavez', 'asdf-bogus' }
+      let(:res) { CircleCi::Project.envvar 'mtchavez', 'asdf-bogus' }
       let(:message) { 'Project not found' }
 
       it 'returns a response object' do
@@ -433,6 +433,10 @@
         res.body['message'].should eql message
       end
     end
+
+    context 'envvars deprecation' do
+      # TODO: Fill this in
+    end
   end
 
   describe 'set_envvar' do