add Webster Learner's Dictionary
add Collins Cobuild Learner's Dictionary
fixed learner's dictionaries can't use popup
Revert "fixed learner's dictionaries can't use popup"

This reverts commit 6969170ec5f4b7e76e06b05ed0e42c2b54ee85fa.
Revert "Revert "fixed learner's dictionaries can't use popup""

This reverts commit cdeb2dc2ebc84590338b8628762670b1b3838457.
avoid popup window in https site
Merge pull request #2 from FreedomKnight/master

Add Some Learner's Dictionaries and iframe insecure data fix.