Refactored gem and tests and fixed a couple of problem areas for windows users

[2potatocakes]

I'm in the process of upgrading an old behemoth of a program that used to use a much older version of mini_magick. The problem I have is that this particular program is always deployed on windows and the latest few versions of mini_magick don't seem to work properly on windows.

Anywho, there's problems associated with reading in IOStream's for windows users that causes a few things to break. I made a heap of changes to my local copy to get everything I need working again, pretty sure everything will still work on linux/mac so thought I'd send you a pull request.

I also pulled in WaYdotNET's fix for the combine options method. Cheers Carlo

All tests are now passing on Ruby 187 and 192 on windows.

But there is 1 catch, this version will need Subexec 0.2.1 with the pull request from tekn0t included.. or an equivalent: pressly/subexec#7

Anyways, up to you guys if you'd like to pull it in. Much appreciate the work you all do ;)

[HamptonMakes]

I'm not sure this counts as a full "refactor", but a lot of the code was cleaned up.
I need to run these tests on Linux and Mac before I can fully bless it.

Also, can you please add to the CHANGELOG for update information.

Also, I'm fine with the programatic version stuff, but it needs to be semi-unified with
the VERSION file already provided.

[2potatocakes]

Hi Hampton,
Yeah apologies on the wording of that commit, it's definitely not a full refactor. I was originally just going to make these changes in my local copy and didn't think I'd end up sending a pull request. I just moved some of the test files and stuff around a little, but the API and all its functions remain unchanged.
Also I just pulled out the version.rb file that I'd added and reverted it back to your original implementation as requested.
Hope it's ok. Cheers again guys ;)

[WaYdotNET]

good job !

[HamptonMakes]

Ok, I'm just waiting for subexec to include this... and I'll merge. I'm going to go bug that repo...