testplan: described the tetraminos and commands to spawn them.
Merge branch 'master' of github.com:LearnProgramming/learntris
Changed command handling to use switch/case instead of if/else
Tetromino class implementation

Created a sqlite database containing all information about each
tetromino type. Tetromino class accesses this database and on
instantiation, queries the database for data given the type.

Tests up to 14 passed.