added bintray distribution management
added bintray links, versions table and contribute section
fixed versions table
added more information about missing help
fixed typos
changed bintray server id, more generic
added beta suffix to versions
changed case
fixed bug: es.search(source) didn't work properly, fixed SearchRequestBuilder#request() method
changed name to methods with es query and filter builders as input due to overloading problem with rhino (even when passing a json argument it'd go within the wrong method
updated readme accordingly to changes
Merge branch 'master' into 0.19

Conflicts:
	pom.xml
	src/main/java/org/elasticsearch/shell/client/builders/core/SearchRequestBuilder.java