Simple implementation of ContentDocument#search
Remove unused variable
Add index of text node to search result
Add id to search result
Define CFI and CFI::Step class
Make it able to pass attributes to CFI::Step.new
Cosmetic data
Add fixture file for tesing search
Change test method name: test_search -> test_search_simple
Define a class for testing search
Add TestContentDocument::TestSearch#test_text_after_child_element
[REFACTROING]Use new #initialize of EPUB::CFI::Step
Add a test for search from img@alt
Fix comment for #search
Add lib/epub/cfi.rb
Align reult of a method called many times to a variable
Implement search which steps over tags
Make #search resturn an array of an array of steps
Test on 2.1.0
[BUGFIX]Fix cursor moving on search