Add todo
Done. Task: add exceptions & error codes;
Task: add MathArray
Done. Task: add phpunit test system for TDD
Test. Add testCreateEmpty, testCreateEmptyNegativeError & testCreateEmptyBadParamError
Update MathArray
AddDone. Task: add matrix; add matrix define
Improve documentation & add comments to MathArray & Matrix
Done: operators with number
Done: Operators with other matrices (sum);
Done: Operators with other matrices (sub);
Done: Transpose matrix
Done. Task: add values at matrix construct
Done. Task: operators multiply matrices
Merge remote-tracking branch 'origin/linear' into development
Merge remote-tracking branch 'origin/development'