added NaN to Chartdata on timeout
fixed export._export_data_to_h5 double id log
added password change page and menu item in front end
Fixed export._export_data_to_h5
updated build.sh
Merge branch 'stable/0.6.x'

Conflicts:
	pyscada/hmi/static/pyscada/hmi/js/pyscada/pyscada.js
	pyscada/hmi/templates/base.html
	pyscada/hmi/templates/content.html
	pyscada/hmi/templates/view_overview.html
removed recording tables, all data will be stored in RecordedDataCache
some improvements in export_to_h5, updated readme.md
Merge branch 'stable/0.6.x'

Conflicts:
	pyscada/__init__.py
Merge branch 'master' into dev/0.7.x