Added stubs for methods to work with indexes
re-organized documentation

Added clear description about config
Added description to initialization example
Add description for data_container_t
Added brief description for lookup_result_t
Fixed example for synchronous write/lookup
Added methods to sync and async work with indexes of elliptics
Added description for several fields of config
Fixed (moved) description of config die_limit
Fixed example 'synchronous write/lookup'
Added asynchronous write/read example
Fixed updated_indexes

Build-fix: update_indexes_async now returns value
If you did not set data for indexes update_indexes will set it to empty
Added info about data_container_t to required parameters
Add metabalancer and mastermind functions

Also fixed declarations of read and write methods - uses data_container_t instead of std::string
Added description for key_t
Added description for async_results
References to data_container_t are used instead of read_result_t.
Added description for status_result_t
Removed unused functions

 - get_path
 - get_paths
 - get_host
 - get_hosts
Removed unused BOOST_PARAMETER_NAME
Merge branch 'feature-new-lookup-result' into current