add new knowledge "Tomcat5.5to7.0" English ver.

add new "migration knowlegde"(English version) from Tomcat 5.5 to Tomcat 7.0.
Modify character code.

Modify character code and dependent character.
Add new knowledge "Tomcat7.0to8.0" Japanese ver.

Add new migration knowlegde that support porting from "Tomcat 7.0" to "Tomcat 8.0".
Merge pull request #12 from kyohei-nakamura/addKnowledgeTomcat5.5to6.0En

Add new knowledge "Tomcat5.5to7.0 (English edition)".
Merge pull request #13 from kyohei-nakamura/addKnowlegdeTomcat7to8Ja

Add new knowledge "Tomcat7.0to8.0 (Japanese edition)".