3.0.11

• Update to Zephir 1.5.0
• Fixed RREF/REF pivot float tolerance
• RREF now zeroes the tail if below EPSILON
• rank(), fullRank(), and inverse() are now consistent
• Matrix::inverse() now throws a RuntimeException on singular input
• Matrix::inverse() now throws an InvalidArgumentException on non-square input
• Fix Poisson distribution when lambda is zero
• Added square check to inverse()
• Cholesky decompose() now throws a RuntimeException on non-positive-definite input
• Added the SingularMatrix exception
• The extension now reduces singular matrices to REF and RREF instead of throwing