move parseInt to jstrutils.nim to avoid conflicts; introduce travis testing

tests/tester.nim

@@ -0,0 +1,15 @@
+# For now we only test that the things still compile.
+
+import os
+
+proc exec(cmd: string) =
+  if os.execShellCmd(cmd) != 0:
+    quit "command failed " & cmd
+
+proc main =
+  exec("nim js tests/diffDomTests.nim")
+  exec("nim js examples/todoapp/todoapp.nim")
+  exec("nim js examples/scrollapp/scrollapp.nim")
+  exec("nim js examples/mediaplayer/playerapp.nim")
+
+main()