Use gcc 5.0 for better C++14 compliance

.travis.yml

@@ -24,10 +24,10 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
           packages:
-            - g++-4.9
+            - g++-5
       env:
-        - MATRIX_CC=gcc-4.9
-        - MATRIX_CXX=g++-4.9
+        - MATRIX_CC=gcc-5
+        - MATRIX_CXX=g++-5
 
     # New GCC
     - os: linux

c++/src/kj/compat/url.h

@@ -37,12 +37,6 @@ struct UrlOptions {
   bool percentDecode = true;
   // True if URL components should be automatically percent-decoded during parsing, and
   // percent-encoded during serialization.
-
-#if __cplusplus < 201402L
-  inline constexpr UrlOptions(bool percentDecode = true): percentDecode(percentDecode) {}
-  // TODO(cleanup): This constructor is only here to support brace initialization in C++11. It
-  //   should be removed once we upgrade to C++14.
-#endif
 };
 
 struct Url {
@@ -103,17 +97,6 @@ struct Url {
   ~Url() noexcept(false);
   Url& operator=(Url&&) = default;
 
-#if __cplusplus < 201402L
-  inline Url(String&& scheme, Maybe<UserInfo>&& userInfo, String&& host, Vector<String>&& path,
-             bool hasTrailingSlash, Vector<QueryParam>&& query, Maybe<String>&& fragment,
-             UrlOptions options)
-      : scheme(kj::mv(scheme)), userInfo(kj::mv(userInfo)), host(kj::mv(host)), path(kj::mv(path)),
-        hasTrailingSlash(hasTrailingSlash), query(kj::mv(query)), fragment(kj::mv(fragment)),
-        options(options) {}
-  // TODO(cleanup): This constructor is only here to support brace initialization in C++11. It
-  //   should be removed once we upgrade to C++14.
-#endif
-
   Url clone() const;
 
   enum Context {