add implementation of set tags (#920)
Merge branch 'develop' into issue-920
add comment (#920)
remove setTags from aws, moved to core (#920)
remove getTags() (#920)
Merge branch 'develop' into issue-920

Conflicts:
	src/main/java/org/dasein/cloud/aws/compute/AutoScaling.java
	src/main/java/org/dasein/cloud/aws/compute/EBSSnapshot.java
	src/main/java/org/dasein/cloud/aws/compute/EC2Method.java
Merge branch 'issue-920' into develop