Add aliases for accessing attributes via [] and []=

This also fixes accessing attributes via symbol name and tests to ensure
that such does not break in the future.

lib/oga/xml/element.rb

@@ -91,6 +91,8 @@ module Oga
         found ? found.value : nil
       end
 
+      alias_method :[], :get
+
       # Adds a new attribute to the element.
       #
       # @param [Oga::XML::Attribute] attribute
@@ -113,11 +115,7 @@ module Oga
         if found
           found.value = value
         else
-          if name.include?(':')
-            ns, name = name.split(':')
-          else
-            ns = nil
-          end
+          name, ns = split_name(name)
 
           attr = Attribute.new(
             :name           => name,
@@ -129,6 +127,8 @@ module Oga
         end
       end
 
+      alias_method :[]=, :set
+
       # Removes an attribute from the element.
       #
       # @param [String] name The name (optionally including namespace prefix)

spec/oga/xml/element_spec.rb

@@ -129,6 +129,13 @@ describe Oga::XML::Element do
     end
   end
 
+  describe '#[]' do
+    it 'is an alias to get' do
+      described_class.instance_method(:[]).should ==
+        described_class.instance_method(:get)
+    end
+  end
+
   describe '#add_attribute' do
     before do
       @element   = described_class.new
@@ -161,6 +168,14 @@ describe Oga::XML::Element do
       @element.get('class').should == 'foo'
     end
 
+    it 'supports the use of Symbols for attribute names' do
+      @element.set(:foo, 'foo')
+      @element.get('foo').should == 'foo'
+
+      @element.set('bar', 'bar')
+      @element.get(:bar).should == 'bar'
+    end
+
     it 'adds a new attribute with a namespace' do
       @element.set('x:bar', 'foo')
 
@@ -186,6 +201,13 @@ describe Oga::XML::Element do
     end
   end
 
+  describe '#[]=' do
+    it 'is an alias to set' do
+      described_class.instance_method(:[]=).should ==
+        described_class.instance_method(:set)
+    end
+  end
+
   describe '#unset' do
     before do
       @element = described_class.new