Merge branch 'dev-using-unified-diff'

Conflicts:
	sample/src/main/java/jp/gr/java_conf/daisy/ajax_mutator/sample/EventMutatorExample.java
	src/test/java/jp/gr/java_conf/daisy/ajax_mutator/mutator/AttributeModificationMutatorTest.java
	src/test/java/jp/gr/java_conf/daisy/ajax_mutator/mutator/DOMAppendingMutatorTest.java
	src/test/java/jp/gr/java_conf/daisy/ajax_mutator/mutator/DOMSelectionMutatorTest.java
	src/test/java/jp/gr/java_conf/daisy/ajax_mutator/mutator/RequestMutatorTest.java
	src/test/java/jp/gr/java_conf/daisy/ajax_mutator/mutator/TimerEventMutatorTest.java
allow put non-version-controled java files in specified directory or with specified name
implement mutation operator for DOMCreation
implement DOM removal to no-op mutation operator