build: require gcc >= 4.8.2 and boost >= 1.54.0

Change-Id: I6778f55f43e517a3d1d28387e953412a5292f063
Refs: #3599
diff --git a/wscript b/wscript
index f51f65a..1f1904b 100644
--- a/wscript
+++ b/wscript
@@ -111,8 +111,8 @@
         conf.env['WITH_OTHER_TESTS'] = 1
 
     conf.check_boost(lib=boost_libs)
-    if conf.env.BOOST_VERSION_NUMBER < 104800:
-        Logs.error("Minimum required boost version is 1.48.0")
+    if conf.env.BOOST_VERSION_NUMBER < 105400:
+        Logs.error("Minimum required boost version is 1.54.0")
         Logs.error("Please upgrade your distribution or install custom boost libraries" +
                    " (http://redmine.named-data.net/projects/nfd/wiki/Boost_FAQ)")
         return