http collector for many url response time

http collector to query data size and download time from HTTP/HTTPS urls
changed collector variable name

stripped . and / from the variable name to be compatible with Graphite and Influxdb
create testhttp.py mock test for http collector
create index fixture
removed ':' from url names
moved the file into fiXtures directory
moved into fixtures
replaced hardcoded timestamp by time()
Merge pull request #633 from prune998/master

http collector