Support for 'env:development os:ios' and vv
Multiplies and devides by 2 on retina displays

I'd find this make much more sense where I use this builtin.
Update compilerUtils.js
Added test app in apps/testing/ALOY-838
Trigger "pre:compile" before app resources are copied

Closes #ALOY-765
https://jira.appcelerator.org/browse/ALOY-765

Allows for operations on `app` files before they are copied to `Resources`, so this operation doesn't need to be done on both or will only be effective on next compile.
[ALOY-838] fixed test app for pr/247
Merge pull request #253 from appcelerator/pr/247

[ALOY-838] config.json options for both platform and environment
[ALOY-842] fix pr/249, make retina conversions automatic for measurement.js, test app
Merge pull request #254 from appcelerator/pr/249

[ALOY-842] retina conversions in measurements builtin
[ALOY-765] add jmk hook prior to copying in assets "pre:load"
Merge pull request #255 from appcelerator/pr/252

[ALOY-765] add jmk hook prior to copying assets/libs "pre:load"
add Alloy version to banner, update contributors
bump HarnessTemplate version to 3.2.0
[ALOY-862] fix index.xml checks in subfolders
Merge pull request #256 from appcelerator/ALOY-862

[ALOY-862] fix index.xml checks in subfolders
fixed unit tests broken with ALOY-862 PR
[ALOY-603] Support child elements for <Widget> and <Require>
fix missing parent symbol for <Require> and <Widget>
fix button image for iOS < 7.0
Merge pull request #258 from appcelerator/ALOY-603

[ALOY-603] Support child elements in <Require> and <Widget> elements