Add this to your CSS to allow align left, right, center and none to images in WordPress posts and pages.

.alignright {
	float: right;
	padding: 10px 0px 10px 10px;
}
.alignleft {
	float: left;
	padding: 10px 10px 10px 0px;
}
.aligncenter {
	clear: both; 
	display: block; 
	margin-left: auto; 
	margin-right: auto;
	padding: 10px;
}
.alignnone {
	padding: 10px 0;
}