Now works with Celery 3.1rc
Merge pull request #104 from ask/fixes_c31_compat

Now works with Celery 3.1rc
Monitor update interval can be customized with updateInterval url param
Fixes grammar #106
flower --version prints flower version info
Fixes #67
Fixes #82
Fixes #103
api accepts async_apply options #85
Improves api error reporting #110
Improves api validation
Fixes #112 escapes vhost in broker api url
Refactors version comparison
Persistent mode is available with Celery 3.0.15 and later #109
Fixes persistent mode warning message
Adds pypi version badge
Adds downloads badge
Let the logger merge in the formatting arguments.
Merge pull request #115 from Celc/master

Let the logger merge in the formatting arguments, so that logs can be grouped.
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