Travis testing to use testflags.py for setting CFLAGS and CXXFLAGS

Added flags include -Wreturn-type and -Wdeclaration-after-statement to
prevent mixed declaration and code and missing return statements which
other compilers require.

testflags.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+c_common = "-Werror -fdiagnostics-show-option -std=gnu89 -Wno-long-long -Wreturn-type -Wdeclaration-after-statement"
+cflags = {
+        "csharp":c_common,
+             "d":c_common,
+            "go":c_common,
+         "guile":c_common,
+          "java":c_common + " -pedantic",
+    "javascript":c_common + " -pedantic",
+           "lua":c_common,
+        "octave":c_common + " -pedantic",
+         "perl5":c_common,
+           "php":c_common,
+        "python":c_common,
+          "ruby":c_common,
+        "scilab":c_common,
+           "tcl":c_common,
+}
+
+cxx_common = "-Werror -fdiagnostics-show-option -std=c++98 -Wno-long-long -Wreturn-type"
+cxxflags = {
+        "csharp":cxx_common,
+             "d":cxx_common + " -pedantic",
+            "go":cxx_common + " -pedantic",
+         "guile":cxx_common,
+          "java":cxx_common,
+    "javascript":cxx_common + " -pedantic",
+           "lua":cxx_common,
+        "octave":cxx_common,
+         "perl5":cxx_common,
+           "php":cxx_common + " -pedantic",
+        "python":cxx_common + " -pedantic",
+          "ruby":cxx_common,
+        "scilab":cxx_common,
+           "tcl":cxx_common,
+}
+
+import argparse
+parser = argparse.ArgumentParser(description="Display CFLAGS or CXXFLAGS to use for testing the SWIG examples and test-suite.")
+parser.add_argument('-l', '--language', required=True, help='set language to show flags for')
+flags = parser.add_mutually_exclusive_group(required=True)
+flags.add_argument('-c', '--cflags', action='store_true', default=False, help='show CFLAGS')
+flags.add_argument('-x', '--cxxflags', action='store_true', default=False, help='show CXXFLAGS')
+args = parser.parse_args()
+
+if args.cflags:
+    print("{}".format(cflags[args.language]))
+elif args.cxxflags:
+    print("{}".format(cxxflags[args.language]))
+else:
+    parser.print_help()
+    exit(1)