Merge pull request #25 from Trainxy/master

Improved the unit-test coverage of applications configurations
Fixed another bug about `Tox\Application\Model` occurred on revision 88b882201b0546f359ab6d9ecdc82ef1f54908a4. #24
Merge pull request #36 from snakevil/master

Fixed the last issue #24 for milestone 0.1.0-beta1.
Added the properties  field  for memcache
Added the properties  field  for memcache
Merge pull request #38 from fuqiang007/master

Added the properties  field  for memcache
Deleted the wrong file name
Fixed #37 the unit-test of memcache for UNSTABLE
Fixed #28,#26 nginx memcache key not md5
Added two exception for nginx memecache function
Deleted the Constant define
Merge pull request #41 from fuqiang007/master

Deleted the Constant define