Update build.jl

Added doctests to build.jl

docs/build.jl

@@ -10,6 +10,15 @@ const modules = [JuliaFEM, JuliaFEM.elasticity_solver]
 # run(`cp $main_folder/$file_ $this_folder`)
 
 cd(dirname(@__FILE__)) do
+    # Run the doctests *before* we start to generate *any* documentation.
+    for m in modules
+        failures = failed(doctest(m))
+        if !isempty(failures.results)
+            println("\nDoctests failed, aborting commit.\n")
+            display(failures)
+            exit(1) # Bail when doctests fail.
+        end
+    end
     # Generate and save the contents of docstrings as markdown files.
     index  = Index()
     for mod in modules