Moving tests to ./tests/testthat/
Moving write/import tests to ./tests/manual/, following Gabor Csardi's [advice](http://stackoverflow.com/questions/25595487/testthat-pattern-for-long-running-tests).
Merge pull request #32 from OuhscBbmc/dev

Moving write/import tests to ./tests/manual/, following Gabor Csardi's [advice](http://stackoverflow.com/questions/25595487/testthat-pattern-for-long-running-tests).