Fixes for GSL 1.16
Added missing forward/backward fixes for compatibility with newer versions of GSL
Added a patch for Ruby-2.1 compatibility
Fixed error in ieee.c:64:31: lvalue required as unary ‘&’ operand
Version 1.16.0
Delete unnecessary files
Merge https://github.com/jakobjanot/rb-gsl.git

Conflicts:
	Rakefile
	VERSION
	ext/linalg.c
	ext/linalg_complex.c
	ext/vector_complex.c
	ext/vector_source.c
	include/rb_gsl_config.h
	rb-gsl.gemspec