#2319 add admin storage page

pom.xml

src/main/java/org/codelibs/fess/Constants.java

...delibs/fess/app/web/admin/general/AdminGeneralAction.java

...ava/org/codelibs/fess/app/web/admin/general/EditForm.java

...delibs/fess/app/web/admin/storage/AdminStorageAction.java

...ava/org/codelibs/fess/app/web/admin/storage/ItemForm.java

...in/java/org/codelibs/fess/exception/StorageException.java

src/main/java/org/codelibs/fess/helper/SystemHelper.java

...n/java/org/codelibs/fess/mylasta/action/FessHtmlPath.java

...ain/java/org/codelibs/fess/mylasta/action/FessLabels.java

...n/java/org/codelibs/fess/mylasta/action/FessMessages.java

.../java/org/codelibs/fess/mylasta/direction/FessConfig.java

...in/java/org/codelibs/fess/mylasta/direction/FessProp.java

src/main/resources/fess_config.properties

src/main/resources/fess_label.properties

src/main/resources/fess_message.properties

src/main/webapp/WEB-INF/view/admin/general/admin_general.jsp

src/main/webapp/WEB-INF/view/admin/storage/admin_storage.jsp

src/main/webapp/WEB-INF/view/common/admin/sidebar.jsp