Fix compatibility issues with v0.4 ntuple

[hackjackhack]

Added a version checking before calling ntuple(). First time sending a PR.

[timholy]

Thanks for tackling this!

Note that even on julia 0.3, this is valid syntax:

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "help()" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.3.7-pre+1 (2015-02-17 22:12 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit d15f183* (110 days old release-0.3)
|__/                   |  x86_64-linux-gnu

julia> ntuple(sin, 3)
(0.8414709848078965,0.9092974268256817,0.1411200080598672)

So I don't think you even need the version check.

[stevengj]

But you should change the REQUIRE file to julia 0.3.

[carlobaldassi]

But you should change the REQUIRE file to julia 0.3.

that syntax works in 0.2 too:

julia> VERSION
v"0.2.1+22"

julia> ntuple(identity, 4)
(1,2,3,4)

I say this would only need the commits to be squashed.

[hackjackhack]

Commits squashed.

[carlobaldassi]

Squashed too much? It seems the commit has been merged with the previous one from master, and I come out as the author instead of you.

[hackjackhack]

Oops! Fortunately, the last commit happens to be "Fix compatibility issues with julia v0.4"
I don't really care about the author stuff. Just want to get rid of the annoying warning message.