updated pom
just double commit
move files in root dir
simplified yaml class name; rename main class as App; remove generated file (dependency-reduced-pom.xml;
deleted special case class which only serve me one time;
remove xml configuration type; correct example file
Merge branch 'master' of github.com:thomasina-lee/smallbatchsqlexecutor

The upstream should only have minor change, therefore we need this merge.
add some documentation