Create basic curlrc class to operate on curlrc file
Inject proxy credentials from curlrc
fix bnc#885957. Now http connection reads curlrc for proxy credentials
Update pac to rev 48
Merge pull request #141 from SUSE/review_140716_add_proxy_support_to_client

[Review] Request from 'KalabiYau' @ 'SUSE/connect/review_140716_add_proxy_support_to_client'