Moving all the base HTML elements to an HTML folder to separate them from the actual library. Since these widgets will exhibit some special behavior, they need to be separate.

Conflicts:
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/Badge.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/CheckBox.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/Collapse.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/Modal.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/base/button/AbstractToggleButton.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/base/mixin/IconTextMixin.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/html/Paragraph.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/html/Span.java
	gwtbootstrap3/src/main/java/org/gwtbootstrap3/client/ui/html/Text.java