Use elliptics::key to read data. Set cache flags for storage IO operations.
Added elliptics_client into list of elliptics libs
Use <> instead of quotes in external include name
Added document reader application. It reads data by URL or ID, parses it and write metadata (timestamp and URL) into stdout and optionaly writes document into specified location
Only download urls with mime starting with text/. Added libmagic support. Use libmagic, when there is no Content-Type header.