Finish with Categories Processing

Finish all the features for category using also the libraries. Now you
can update a category-add a new category and also delete a category. Add
to HistoryListView Item the letterImageView lib
Merge remote-tracking branch 'origin/master'

Conflicts:
	app/src/main/AndroidManifest.xml

	app/src/main/java/myexpenses/ng2/com/myexpenses/Data/CategoryDatabase.java
	app/src/main/java/myexpenses/ng2/com/myexpenses/MainActivity.java
	app/src/main/res/layout/activity_main.xml
	app/src/main/res/values/strings.xml
Merge branch 'master' of https://github.com/dirknick/MyExpenses

Conflicts:

	app/src/main/java/myexpenses/ng2/com/myexpenses/Data/CategoryDatabase.java