[geary] Add Fedora vala-tools dependency to INSTALL

[Jim Nelson <jnelson src gnome org>]

commit 54dad5e1a72390f3072379f4405ea421ab9c20d1
Author: Jim Nelson <jim yorba org>
Date:   Tue Jan 7 14:21:37 2014 -0800

    Add Fedora vala-tools dependency to INSTALL

 INSTALL |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/INSTALL b/INSTALL
index 1b38abf..abca9aa 100644
--- a/INSTALL
+++ b/INSTALL
@@ -18,6 +18,7 @@
 
     Building Geary requires Vala 0.22.1 or higher with a full GObject
     introspection repository, intltool, cmake, and desktop-file-validate.
+    Vala's vapigen must be installed as well.
 
     The developer packages and headers for the following libraries are also
     required when building Geary:
@@ -62,7 +63,7 @@
         $ sudo yum install gobject-introspection-devel intltool cmake \
             desktop-file-utils libcanberra-devel libgee-devel glib2-devel \
             gmime-devel gtk3-devel libnotify-devel sqlite-devel unique3-devel \
-            webkitgtk3-devel libsecret-devel libxml2-devel
+            webkitgtk3-devel libsecret-devel libxml2-devel vala-tools
 
 
   * Installing dependencies on Ubuntu