Basic Conan packaging files added (#157).

The previous conanfile.txt has been replaced by the conanfile.py.

conanfile.py

+import os
+
+from conans import ConanFile, CMake, tools
+
+
+class ScopeguardConan(ConanFile):
+    name = "scope-guard"
+    version = "0.3.5"
+    license = "MIT"
+    author = "offa <offa@github>"
+    url = "https://github.com.offa/scope-guard"
+    description = "Implementation of Scoped Guards and Unique Resource as proposed in P0052."
+    homepage = "https://github.com/mrtazz/restclient-cpp"
+    topics = ("cpp", "cpp17", "p0052", "scope-guard",
+              "scope-exit", "scope-fail", "scope-success", "unique-resource", "cmake")
+    no_copy_source = True
+    _source_dir = "{}-{}".format(name, version)
+    scm = {
+        "type": "git",
+        "subfolder": _source_dir,
+        "url": "{}.git".format(homepage),
+        "revision": version
+    }
+    requires = (
+        "Catch2/2.9.2@catchorg/stable",
+        "trompeloeil/v34@rollbear/stable"
+    )
+
+
+    def _configure_cmake(self):
+        cmake = CMake(self)
+        cmake.configure(source_folder=self._source_dir, build_folder="build")
+        return cmake
+
+    def package(self):
+        cmake = self._configure_cmake()
+        cmake.install()

conanfile.txt

-[requires]
-Catch2/2.9.2@catchorg/stable
-trompeloeil/v34@rollbear/stable
-
-[generators]
-cmake_find_package
-cmake_paths
-

test_package/CMakeLists.txt

+cmake_minimum_required(VERSION 2.8.12)
+project(PackageTest CXX)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_executable(example example.cpp)
+target_link_libraries(example ${CONAN_LIBS})
+
+# CTest is a testing tool that can be used to test your project.
+# enable_testing()
+# add_test(NAME example
+#          WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/bin
+#          COMMAND example)

test_package/conanfile.py

+import os
+
+from conans import ConanFile, CMake, tools
+
+
+class ScopeguardTestConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake"
+
+    def build(self):
+        cmake = CMake(self)
+        # Current dir is "test_package/build/<build_id>" and CMakeLists.txt is
+        # in "test_package"
+        cmake.configure()
+        cmake.build()
+
+    def imports(self):
+        self.copy("*.dll", dst="bin", src="bin")
+        self.copy("*.dylib*", dst="bin", src="lib")
+        self.copy('*.so*', dst='bin', src='lib')
+
+    def test(self):
+        if not tools.cross_building(self.settings):
+            os.chdir("bin")
+            self.run(".%sexample" % os.sep)

test_package/example.cpp

+#include <iostream>
+#include "hello.h"
+
+int main() {
+    hello();
+}