implemented music pattern, allowing multiple simulataneous sequences with instruments
implemented song logic
+63 failing tests: note time extension using equal character
+63 test pass: implemented note time extesion using equal character
+189 failing tests: octave num on notes
refactor on seqparser specs to avoid repeated expectations on code
+189 test pass: octave num on notes
implemented example for patterns using astro robo sasa lvl1 song (only one pattern)
+10 failing tests: when there is pipes among notes, should ignore the character
+10 test pass: should ignore pipe characters on sequence notation
completed sample music of sasa lvl1