admin-ui: Add clear-all functionality

Fix apyrgio/synnefo#124
admin-ui: Disable the selection of a row by clicking on it

Now, in order to select a row, the user must clicks in the checkbox.

Fix apyrgio/synnefo#108
admin-ui: Add some tooltips

Fix apyrgio/synnefo#112
admin-ui: Set cursor of checkboxes to be pointer
admin-ui: Modify arrow button of details

Now, only by clicking the arrow the corresponding area expands.
The arrow now is replaced by a font-icon.

Fix apyrgio/synnefo#130
Merge branch 'feature-admin-ui-new' into feature-admin