+ port factor analysis from tapkee
+ factor analysis class in converter and fa/spe refactoring
fa and spe now share interface for the parameter max. iterations
Merge pull request #894 from iglesias/fa

+ port factor analysis from tapkee
Ported a few more fixes and additions from tapkee

- Added random projection method
- Added missed mean subtraction in projection and out-of-sample projection
- Fixed implementation of isomap and landmark isomap