ignore IntelliJ project files
https://github.com/rometools/rome-fetcher/issues/16
set HTTP header field user-agent even when caching is enabled
Merge pull request #17 from Joerg-Schoemer/master

set HTTP header field user-agent even when caching is enabled
Merge pull request #12 from janih/master

Retry handler setter for HttpClientFeedFetcher