Modified to support a formula with a line feeds.
Created originally on Bitbucket by ysdfix (Masato Yoshida)
Was already merged in Bitbucket before import, marked as merged by the import user
I canceled the previous PR(#280 (closed)) and created a new PR.
- Modified to support a formula with a line feeds
- Added test read formula with a line feeds.
- Edited unit tests in TestTokenizer.
This change is related to #723.
This change is to support workbooks with formulas containing newlines(line-feeds).