Updated webapi.py to use the same timeframe of "recently" as in webserve.py

Updated webapi.py to use the same timeframe of "recently" as in webserve.py
Webapi fixed the recently to 3 days by webserve uses the value from the config so If you have a missed episode in "comingEpisodes" greater older than 3, It won't show in "Missed" API

http://sickbeard.com/forums/viewtopic.php?f=4&t=8201&p=38437#p38437
Merge pull request #397 from fernandog/patch-4

Updated webapi.py to use the same timeframe of "recently" as in webserve...