changed namespaces
changed text in README.md
Merge branch 'dev'

Conflicts:
	README.md
remove redundant module.xml
remove impossible rewrite (class does not exist)

also this rewrite is part of ElasticgentoCatalog, too
add Issue document

to keep track of problems
fix wrong named class property
in case of exception: log it
fill catalog_search_results from elastic search
use some of the searchable fields for search
speed up reindex prozess
dont block reindex all, as it does importent stuff
Pulled in master branch