change #inline? memoization from ||= to defined?

||= doesn't make sense in this case because it's a boolean. If @inline
is false, it will unnecessarily be written to.
Merge pull request #985 from signaturelabs/inline_memoization

change #inline? memoization from ||= to defined?
Added tests for Resque::WorkerQueueList
Updated tests based on the excellent feedback from @steveklabnik

* Converted to Unit syntax
* Removed test for regular constructor usage
* Swapped false checks for refute
Verifying the NoQueueError is thrown in Worker#initialize
Merge pull request #989 from adomokos/drying_up_test

Verifying the NoQueueError is thrown in Worker#initialize
Fixing the homepage url in resque.gemspec
Removed blank lines
Merge pull request #990 from adomokos/fixing_homepage

Fixing the homepage url in resque.gemspec
Merge pull request #987 from einarj/WorkerQueueListTests

Worker queue list tests
Add unit tests for Resque::Coder
Merge pull request #991 from kpshek/add_unit_tests_for_coder

Add unit tests for Resque::Coder