Including part of the report

Still need to do

  - A good introduction
  - Generalizing the spectral analysis
  - Behavior of s_k^noise and s_k^exact
  - Talk about FFT
  + k_{noise} without spectral decomposition
  + Finding \delta_{noise}
  - Conclusion and remarks

The + are supposed to be quick and just reference to Ivete's paper.

Please include the figure. Everyone includegraphics command is comment.
Merge branch 'master'

Just merge part of my part and Juan's part.

Conflicts:
	tex/report/report.tex