Ticket #2739: add support of epub format.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

misc/ext.d/doc.sh.in

@@ -69,6 +69,9 @@ do_view_action() {
     djvu)
         djvused -e print-pure-txt "${MC_EXT_FILENAME}"
         ;;
+    epub)
+        einfo -v "${MC_EXT_FILENAME}"
+        ;;
     *)
         ;;
     esac
@@ -158,6 +161,9 @@ do_open_action() {
     comic)
         cbrpager "${MC_EXT_FILENAME}" &
         ;;
+    epub)
+        lucidor "${MC_EXT_FILENAME}" >/dev/null &
+        ;;
     *)
         ;;
     esac

misc/mc.ext.in

@@ -604,6 +604,12 @@ regex/i/\.djvu?$
 regex/i/\.cb[zr]$
 	Open=@EXTHELPERSDIR@/doc.sh open comic
 
+# Epub
+shell/i/.epub
+	Open=@EXTHELPERSDIR@/doc.sh open epub
+	View=%view{ascii} @EXTHELPERSDIR@/doc.sh view epub
+
+
 ### Miscellaneous ###
 
 # Compiled Java classes