Better test for SubRipReader
Do not add empty line which separates the subtitles in SubRip
Add test on read dates for subtitles
Add line in SubRip writer

uses the line separator of the platform
Add a method so implementation of SubtitleReader can get the character set
Add contstructor to allow setting the charset in SubRipReader
Complete javadoc
Add a method fo implementation of SubtitleWriter can get the character set
Add constructor to allow setting the character set in SubRipWriter
Add test suite for the SubRipWriter class

to be implemented
Fix write integer
Complete tests of SubRipWriter