Conan build packages on CI (#4590) (#4594)

* Build Conan package on Travis CI (#4590)

- Added multi package support on Linux, running on Travis CI
- Only upload when branch is a tag and named "vX.Y.Z"
- Replace Conan injection by Conan wrapper
- Removed os_build os_arch -- Conan 1.0.1 hotfix

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on OSX (#4590)

- Added jobs to build Flatbuffers on OSX running on Travis

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on Windows (#4590)

- Added support necessary to build Flatbuffers on Windows (conan)
- Added Appveyor jobs to build Conan package
- Only build Conan package when release (tag)

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Reduce Conan CI support to simple scripts (#4590)

- Removed msvc 10 x86_64 workaround
- Updated conan remote address
- Added Bincrafters' package tools

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Add fPIC option on Conan recipe (#4590)

- Add fPIC as optional. It works on Linux and OSX
- Update recipe metadata: author, homepage, license
- Checking for flatc and flathash on Conan package

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on CI (#4590)

- Add rule to run conan job only for tags
- Run Conan on Linux, OSX and Windows
- Update package tool to new interface

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Update Conan username (#4590)

- Use google as default username

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Update OSX version on CI (#4590)

- Use latest OSX 9.3 version to build Conan package

Signed-off-by: Uilian Ries <uilianries@gmail.com>

conan/test_package/test_package.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2018 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <cstdlib>
+#include <iostream>
+#include "flatbuffers/util.h"
+
+// Test to validate Conan package generated
+
+int main(int /*argc*/, const char * /*argv*/ []) {
+
+  const std::string filename("conanbuildinfo.cmake");
+
+  if (flatbuffers::FileExists(filename.c_str())) {
+    std::cout << "File " << filename << " exists.\n";
+  } else {
+    std::cout << "File " << filename << " does not exist.\n";
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}