add namespace-related flags

defaults changed in HHVM 4.73

.hhconfig

@@ -9,5 +9,8 @@ user_attributes=
 disable_static_local_variables = true
 disable_primitive_refinement=true
 disallow_array_literal = true
+enable_xhp_class_modifier=false
+disable_xhp_element_mangling=false
+disable_xhp_children_declarations=false
 allowed_decl_fixme_codes=2049,2053,4045
 allowed_fixme_codes_strict=2011,2049,2050,2053,4026,4027,4045,4053,4057,4107,4108,4110,4112,4128,4135,4188,4240,4281,4323,4343

.travis.sh

@@ -9,7 +9,16 @@ php --version
   cd $(mktemp -d)
   curl https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 )
-composer install
+composer install --no-autoloader
+
+hhvm \
+  -dhhvm.hack.lang.enable_xhp_class_modifier=false \
+  -dhhvm.hack.lang.disable_xhp_element_mangling=false \
+  vendor/bin/hh-autoload
 
 hh_client
-vendor/bin/hacktest tests/
+
+hhvm \
+  -dhhvm.hack.lang.enable_xhp_class_modifier=false \
+  -dhhvm.hack.lang.disable_xhp_element_mangling=false \
+  vendor/bin/hacktest tests/