Release Version 2.0.0

• Dropped support of C++11, now requires a C++14 or higher compiler
• Added support for std::complex<T>, closing Issue #58
• Added more NdArray constructors for STL containers including std::vector<std::vector<T>>, closing Issue #59
• Added polyfit routine inline with Numpy polyfit, closing Issue #61
• Added ability to use NdArray as container for generic structs
• Non-linear least squares fitting using Gauss-Newton
• Root finding routines
• Numerical integration routines
• lu_decomposition and pivotLU_decomposition added to Linalg namespace
• New STL iterators added to NdArray
  • iterator
  • const_iterator
  • reverse_iterator
  • const_reverse_iterator
  • column_iterator
  • const_column_iterator
  • reverse_column_iterator
  • const_reverse_column_iterator
• Added rodriguesRotation and wahbasProblem to Rotations namespace
• Various efficiency and/or bug fixes