fix(select2): Up-direction when using global theme

select2 theme working well when the direction for the dropdown is set 
to up, earlier it was working only when theme was set by the directive 
and not working for globally set theme.

Closes #1674

src/common.css

@@ -46,12 +46,14 @@ body > .select2-container.open {
 }
 
 /* Handle up direction Select2 */
-.ui-select-container[theme="select2"].direction-up .ui-select-match {
+.ui-select-container[theme="select2"].direction-up .ui-select-match,
+.ui-select-container.select2.direction-up .ui-select-match {
     border-radius: 4px; /* FIXME hardcoded value :-/ */
     border-top-left-radius: 0;
     border-top-right-radius: 0;
 }
-.ui-select-container[theme="select2"].direction-up .ui-select-dropdown {
+.ui-select-container[theme="select2"].direction-up .ui-select-dropdown,
+.ui-select-container.select2.direction-up .ui-select-dropdown {
     border-radius: 4px; /* FIXME hardcoded value :-/ */
     border-bottom-left-radius: 0;
     border-bottom-right-radius: 0;
@@ -63,10 +65,12 @@ body > .select2-container.open {
 
     margin-top: -4px; /* FIXME hardcoded value :-/ */
 }
-.ui-select-container[theme="select2"].direction-up .ui-select-dropdown .select2-search {
+.ui-select-container[theme="select2"].direction-up .ui-select-dropdown .select2-search,
+.ui-select-container.select2.direction-up .ui-select-dropdown .select2-search {
     margin-top: 4px; /* FIXME hardcoded value :-/ */
 }
-.ui-select-container[theme="select2"].direction-up.select2-dropdown-open .ui-select-match {
+.ui-select-container[theme="select2"].direction-up.select2-dropdown-open .ui-select-match,
+.ui-select-container.select2.direction-up.select2-dropdown-open .ui-select-match {
     border-bottom-color: #5897fb;
 }