2014-01-22: merge default into stable. stable v0.5.7

merge default into stable.

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 dnl run `autoreconf -i` to generate a configure script. 
 dnl Then run ./configure to generate a Makefile.
 dnl Finally run make to generate the project.
-AC_INIT([wisp], [0.5.6],
+AC_INIT([wisp], [0.5.7],
         [arne_bab@web.de])
 # Check for programs I need for my build
 AC_CANONICAL_TARGET
diff --git a/wisp-repl-guile.sh b/wisp-repl-guile.sh
--- a/wisp-repl-guile.sh
+++ b/wisp-repl-guile.sh
@@ -2,7 +2,12 @@
 
 # if the spec file does not exist yet, run the build chain
 if test ! -f language/wisp/spec.scm; then
-    autoreconf -i && ./configure && make
+    autoreconf -i && ./configure && make check
 fi
 
-guile -L . --language=wisp
+# if the file still does not exist, our chain is broken
+if test ! -f language/wisp/spec.scm; then
+    echo "ERROR: wisp failed to compile. Please check the previous output."
+else
+    guile -L . --language=wisp
+fi