(fix) read MS Excel table
(add) import simple exercise from ms excel
Merge branch 'master' of github.com:imhatep/physical_training

Conflicts:
	app/src/main/assets/rating_table.xls
	app/src/main/java/com/mil/physicaltraining/ActionsActivity.java
	app/src/main/java/com/mil/physicaltraining/MSExcelHelper.java
	app/src/main/java/com/mil/physicaltraining/Workspace.java
	app/src/main/res/values/strings.xml