rename out_norikra to out_norikra_filter
rename
Big refactoring to separate features of input and output into different mixin and plugins
 * out_norikra_filter renamed from out_norikra
   * simple and casual filter usage of norikra as same as out_exec_filter
   * re-writing with input/output mixins to separate input/output features for each plugin
 * FetchRequest class to manage data fetch api for norikra
   * event/sweep APIs are supported (abstractions for new api like 'listen')
 * out_norikra
   * simple output plugin to support distributed output
     and other features for large scale deployment in future
 * in_norikra
   * simple input plugin to support incoming api in future
fix configuration examples for current versions of code
update for v0.1.0