Spectra v0.2.0

Added

• Benchmark script now outputs number of matrix operations
• Added a simple built-in random number generator, so that the algorithm
  was made to be deterministic
• Added the wrapper class DenseSymMatProd for symmetric matrices

Changed

• Improved Arnoldi factorization
  • Iteratively corrects orthogonality
  • Creates new residual vector when invariant subspace is found
  • Stability for matrices with repeated eigenvalues is greatly improved
• Adjusted deflation tolerance in double shift QR
• Updated result analyzer
• Updated copyright information
• API change: Default operator of SymEigsSolver was changed from
  DenseGenMatProd to DenseSymMatProd