FUEL: unmask `fuel-refresh-all`

`fuel-refresh-all` is documented as mapped onto "\C-c\C-r", but this was
masked by an undocumented mapping for `fuel-eval-region` (which is
already bound to "\C-c\C-e\C-r").
system-info.macosx: code name for 10.9.
sets.extras: change non-repeating to use remove-first!.
math.combinatorics: specialized version of nths-unsafe for performance.
math.statistics: Fix out of bounds on quantiles that should return the first element.
math.statistics: [-] Golfed.
math.extras: adding round-away-from-zero.
math.statistics: Add trimean.
math.statistics: Handle some edge cases.
Remove two unused parameters.
game.loop: Fix throwing errors inside game loop.
gml, euler: Initial commit.
game.loop: Fix docs.
euler.b-rep: Fix usage of HEX: in unit tests.
splitting: cleanup duplicate code.
byte-arrays: faster clone-like when both arguments are byte-arrays.
strings: faster clone-like when both arguments are strings.
math.statistics: use >array instead of { } clone-like.
spelling: some performance improvements, and minor fixes.
splitting.extras: adding split-harvest in "core style" (ugh!).
Merge branch 'master' of github.com:tgunr/factor into dev

Conflicts:
	.gitignore
	basis/tools/continuations/continuations-docs.factor
	basis/tools/continuations/continuations.factor
	basis/tools/walker/walker.factor
	build-support/factor.sh
	misc/fuel/fuel-edit.el