deep refactor of documentation

deep refactor of documentation
Merge pull request #169 from simboss/master

Documentation Review for Master
doc: fix sphinx warnings
doc: update images
doc: task executor update
doc: fix demo. Renew images. demo: added config dir
demo: added config dir and data dir
doc: refine index
fix: start.bat script
fix: #171 Ugrade xstream version. fix: clean gui deps. fix: clean scripting issue with jre 6
fix: complete script-api and js removal