Merge pull request #221 from epam/dev

Adding podspecs for 1.1.2 version
#166. Adding basic implementation for Cache Manager
#166. Extending cache implementation, adding basic support of cache control header fields
#166. Adding first test for cache manager in web services
Adding new test for caching functionality
Merge remote-tracking branch 'epam/dev' into Web_Response_Caching
Added tests for cache attributes
Added caching functionality for etag and last-modify header. Added test for it
Removing leaked files web response
Adding drop cache functionality and unit test for it
#107. Adding downloadfaker to pass simian check
Fixing not loaded core data model on CI
Moving cache model out from resource folder
Resolving problem with unescaped pathes for cache model
Adding logging to capture travis-ci error
Adding more logging to capture travis-ci error
Creating cache directory via travis config file
Creating cache directory via travis config file. fix
Adding new checks for dropping cache
Adding more logging for dropping cache