Merge branch 'release/0.0.19' into develop
readme: test markdown
readme: test markdown
readme: updated hyperlinks
readme: improved readability
src: improved readability
src: added RowVector.hpp
src: added instance method 'RowVector.get()'
src: added instance method 'RowVector.set()'
src: added instance method 'RowVector.mula()'
src: added src/RowVector/definitions.hpp
src: modified 'Vector.mula()' to support RowVector
src: supported RowVector
src: added common types 'RowVector' and 'CRowVector'
src: using RowVector
src: supported RowVector and CRowVector
src: fixed a mistake
src: added files for CRowVector
src: added CRowVector
src: supported RowVector and CRowVector