fix pattern to allow gem's name with a period

lib/gemnasium/parser/patterns.rb

@@ -1,7 +1,7 @@
 module Gemnasium
   module Parser
     module Patterns
-      GEM_NAME = /[a-zA-Z0-9\-_]+/
+      GEM_NAME = /[a-zA-Z0-9\-_\.]+/
       QUOTED_GEM_NAME = /(?:(?<gq>["'])(?<name>#{GEM_NAME})\k<gq>|%q<(?<name>#{GEM_NAME})>)/
 
       MATCHER = /(?:=|!=|>|<|>=|<=|~>)/

spec/gemnasium/parser/gemfile_spec.rb

@@ -43,6 +43,12 @@ def reset
     dependencies.size.should == 0
   end
 
+  it "parses gems with a period in the name" do
+    content(%(gem "pygment.rb", ">= 0.8.7"))
+    dependency.name.should == "pygment.rb"
+    dependency.requirement.should == ">= 0.8.7"
+  end
+
   it "parses non-requirement gems" do
     content(%(gem "rake"))
     dependency.name.should == "rake"

spec/gemnasium/parser/gemspec_spec.rb

@@ -55,6 +55,16 @@ def reset
     dependencies.size.should == 0
   end
 
+  it "parses gems with a period in the name" do
+    content(<<-EOF)
+      Gem::Specification.new do |gem|
+        gem.add_dependency "pygment.rb", ">= 0.8.7"
+      end
+    EOF
+    dependency.name.should == "pygment.rb"
+    dependency.requirement.should == ">= 0.8.7"
+  end
+
   it "parses non-requirement gems" do
     content(<<-EOF)
       Gem::Specification.new do |gem|