Added "std_sstream.i" to interfaces. Closes #311.
Added "std_sstream.i" to interfaces. Closes #311.

ucrcsedept/galah-interact-python,galah-group/galah-interact-python,galah-group/galah-interact-python,ucrcsedept/galah-interact-python,galah-group/galah-interact-python,ucrcsedept/galah-interact-python