Added scripts for fetching and building curl

Common/3dParty/curl/build.bat

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+SET SCRIPTPATH=%~dp0
+CD /D %~dp0
+SET PLATFORM=win_32
+if defined ProgramFiles(x86) (
+	SET PLATFORM=win_64
+)
+
+if defined TARGET (
+	SET PLATFORM=%TARGET%
+)
+
+if "%PLATFORM%" == "win_32" (
+  SET MACHINE=x86
+)
+
+if "%PLATFORM%" == "win_64" (
+  SET MACHINE=x64
+)
+
+SET VC="%ProgramFiles%\Microsoft Visual Studio 12.0\VC"
+SET VC64="%ProgramFiles(x86)%\Microsoft Visual Studio 12.0\VC"
+if exist %VC64% (
+	SET VC=%VC64%
+)
+
+call %VC%\vcvarsall.bat %MACHINE%
+
+cd curl
+call buildconf.bat
+cd winbuild
+nmake /f Makefile.vc mode=static ENABLE_WINSSL=yes MACHINE=%MACHINE% VC=12
+
+if not exist "%SCRIPTPATH%%PLATFORM%" (
+   md %SCRIPTPATH%%PLATFORM%\build
+   xcopy /Y /S ..\builds\libcurl-vc12-%MACHINE%-release-static-ipv6-sspi-winssl\lib\libcurl_a.lib %SCRIPTPATH%%PLATFORM%\build\
+   mv %SCRIPTPATH%%PLATFORM%\build\libcurl_a.lib %SCRIPTPATH%%PLATFORM%\build\curl.lib
+)
+
+cd ..\..

Common/3dParty/curl/fetch.bat

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+SET CURL_FOLDER=curl
+IF NOT EXIST %CURL_FOLDER% CALL git clone https://github.com/curl/curl.git %CURL_FOLDER%
+CD %CURL_FOLDER%
+CALL git fetch
+CALL git checkout curl-7_54_1
+CD ..

Common/3dParty/curl/fetch.sh

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+CURL_FOLDER=curl
+if [ ! -d ${CURL_FOLDER} ]; then
+  git clone https://github.com/curl/curl.git ${CURL_FOLDER}
+cd ${CURL_FOLDER}
+git fetch
+git checkout curl-7_54_1
+cd ..