rename shogun -> modshogun for R and add some fixes
add some unit-tests for likelihood models
replace eigen3 exp() call with shogun exp() call
Merge pull request #1325 from votjakovr/feature/gp_refactoring

Add some unit-tests for likelihood models
add get_copy function to lib/memory to be used from typemaps for clones
fix typo in doxygen formula
add some get_strdup function to avoid compile errors (strdup is not ansi C!)
use strtod if strtold is not available
drop get_copy from octave and perl