added stderr redirect environment variable.
Updated guide to work with iOS 6.1 and Xcode 4.6.1

Added link to downloads.
Added suggestion to turn on Automatic reference counting.
Added suggestion to link QuartzCore on error.
modernizing MacOS project for Xcode 5

* changed support from 10.6 to 10.7 - it has to happen at some point;
  why not now?

* removed support for 32 bit arch - there hasn't been one of these in
  a long time

* converted several NSInteger types to short to suppress compiler
  warnings iOS/MacOS

* suppressed compiler warnings in `GHTesting.m` with an internal
  category

* removed duplicate method definition
  receiveData:statusCode:MIMEType:afterDelay from GHMockURLConnection

* enabled many, many, many warnings to get a handle on the state of
  the code
Merge remote-tracking branch 'gardner/master' into 0.5.6-rebase-gardner-119
updates change log for merge 113
Merge remote-tracking branch 'jar-interactive/master' into 0.5.6-merge-jar-interactive-113
applies GHUNIT_STDERR_REDIRECT to MacOS app.  updated docs
ran modernizer on MacOS project
updating iOS project to Xcode 5

* updated the GHUnitIOSTestMain.m in the Tests target based on the
  swizzle approach
  - https://github.com/gabriel/gh-unit/issues/96
* updated Scripts/RunTests.sh
  - now sets `CFFIXED_USER_HOME` based on:
    * http://goo.gl/ifXaqf
    * http://www.egeek.me/2012/10/03/jenkins-ghunit-launch-msg-error/
  - disabled all that funky trapping/launchctl stuff
    * i don't know what it is supposed to do
    * it did not work out of the box
    * it never worked on Jenkins CI
* updated the Test target build settings to use ARC - how this was
  working before is a mystery, and not just to me.
    - https://github.com/Yelp/gh-unit/pull/3
    - thanks @bmelts, @bashery
* fixed Text target framework search path problem - was trying to
  import `iPhoneSimulator5.0.sdk framework`.
* changed project deployment target to 5.1.1 - min to allow 64-bit
  slice
* changed project Makefile to build static lib for all architectures