Extract extractSentences method and the tests
Support perriod in succession
Add handling of non ascii period
Extract handling of succesive periods into a method
Support header with multiple sentences
Support header string without perrid
Support list element to have multiple sentences
Refactor SentenceIterator and add a test case
Make SentenceIterator check the header sentences
Make SentenceIterator check the sentences in list blocks
Small fix
Merge pull request #44 from takahi-i/fix-sentence-iteration

Make SentenceIterator checks sentences in lists and headers