Change copy constructor's arg.
Hide internal constructor form C#
Add constructer which used from C# code.
fix bug of index out of range
Add abs, ang and power methods.
Change type of Real and Imag parameter to IEnumerable

IEnumerator was not usefull.
Wrapper class was added.
Fix bug about array size allocation on mathematical operation.
add make_ps_h.rb for project.
Add IEnumerable for Abs, Power and Ang.

For these kind of operation, naming rule is follows.
  Property, which captialized, returns IEnumerable
  methods, downcased, returns handle of array.
Fix Bug that array size is increased by FFT or iFFT.
Fix bug:  adding include <cmath>
Add real and imag method.
Modify test due to return type change of Real and Imag properties
ignore bash history