#19 Developer directory is hardcoded in scripts and build conf

[Nikita Zhuk]

RegexKit doesn't compile when Developer Tools are installed in some other location than '/Developer'. Currently there are several places where '/Developer' path is hard coded:

Source/Build/Scripts:
buildDistribution.sh
fileCheck.pl
packageDist.pl

Source/Build/Xcode:
RegexKit Build Settings.xcconfig

Instead of hardcoding these paths, env variables should be used (DEVELOPER_DIR, DEVELOPER_SDK_DIR etc).