Added support for strongly retained queues

Also removed superfluous NSLogging
Fix NEEDS_DISPATCH_RETAIN_RELEASE checks
Merge pull request #13 from samsoffes/master

Fix NEEDS_DISPATCH_RETAIN_RELEASE checks
Fixed podspec tag.
Merge pull request #17 from irrationalfab/master

Fixed podspec tag.
Clear out reachable and unreachable blocks (which should release in non-ARC environments)
added checking for obj_arc to determine if the project is using ARC, to eliminate the warning
Merge pull request #20 from xpg/master

Eliminate warning when project is not using ARC
fixed typo
updated podspec
Add a description to Reachability objects; this gives better output when doing 'po <object>' while debugging.
Merge pull request #26 from cbowns/master

Add a debug description to Reachability objects
Remove calls from debug description that may block for 'some' (i.e. maybe a while?) time.
Merge pull request #27 from cbowns/master

Remove might-block-for-a-while calls from description
use Apple's flag instead of reinventing the wheel

solution for issue #28
Merge pull request #30 from ddrscott/patch-1

use Apple's flag instead of reinventing the wheel
Added licence & updated readme to include building docs.
Extra clarification in the docs
Added link to wiki page for projects using reachability
fixes issue #43