updated README
updated test code
comment cleanup
removed hard-coded "method + 2 arguments" from MPD::send() method
rewrote MPD::send() method to use variable number of arguments
Merge branch 'feature/adjust-arguments-to-send-method' into develop
added comments detailing commands to be created
code cleanup
removed error message of failed login
updated comments for implemented commands
added @todos
added invalid argument exception
added validation to move method
code cleanup
added (very simple) validation to add method
Merge branch 'release/0.0.3-alpha'