Refactoring of .travis.yml.
Refactoring of .travis.yml.

Some parameters were added to update target OS versions easily.

yoichitgy/Swinject,Swinject/Swinject,yoichitgy/Swinject,yoichitgy/Swinject,yoichitgy/Swinject,Swinject/Swinject,Swinject/Swinject,Swinject/Swinject