Added build commands for various versions of Visual Studio

- For people who want to build the library without opening it in VS

.gitignore

@@ -23,6 +23,7 @@ projects/VS2010
 projects/VS2012
 projects/VS2013
 projects/VS2015
+build/bin
 
 # IDEA solution files
 *.idea

build/build.VS2010.cmd

@@ -0,0 +1,7 @@
+@echo off
+
+rem build 32-bit
+call "%~p0%build.generic.cmd" VS2010 Release "Clean,Build" Win32 v100
+
+rem build 64-bit
+call "%~p0%build.generic.cmd" VS2010 Release "Clean,Build" x64 v100

build/build.VS2012.cmd

@@ -0,0 +1,6 @@
+@echo off
+
+rem build 32-bit
+call "%~p0%build.generic.cmd" VS2012 Release "Clean,Build" Win32 v110
+rem build 64-bit
+call "%~p0%build.generic.cmd" VS2012 Release "Clean,Build" x64 v110

build/build.VS2013.cmd

@@ -0,0 +1,7 @@
+@echo off
+
+rem build 32-bit
+call "%~p0%build.generic.cmd" VS2013 Release "Clean,Build" Win32 v120
+
+rem build 64-bit
+call "%~p0%build.generic.cmd" VS2013 Release "Clean,Build" x64 v120

build/build.VS2015.cmd

@@ -0,0 +1,7 @@
+@echo off
+
+rem build 32-bit
+call "%~p0%build.generic.cmd" VS2015 Release "Clean,Build" Win32 v140
+
+rem build 64-bit
+call "%~p0%build.generic.cmd" VS2015 Release "Clean,Build" x64 v140

build/build.generic.cmd

@@ -0,0 +1,38 @@
+@echo off
+
+rem
+rem Parameters
+rem   %1: vs_solution_version: VS solution version: VS2012, VS2013, VS2015
+rem   %2: vs_configuration:    VS configuration:    Debug, Release
+rem   %3: vs_target:           target:              Build or Rebuild
+rem   %4: vs_platform:         platform:            x64 or Win32
+rem   %5: vs_toolset:          toolset:             v100, v110, v120, v140
+rem
+
+set vs_solution_version=%1
+set vs_configuration=%2
+set vs_target=%3
+set vs_platform=%4
+set vs_toolset=%5
+
+set msbuild="%windir%\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
+IF %vs_solution_version% == VS2013 SET msbuild="C:\Program Files (x86)\MSBuild\12.0\Bin\MSBuild.exe"
+IF %vs_solution_version% == VS2015 SET msbuild="C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe"
+rem TODO: Visual Studio "15" (vNext) will use MSBuild 15.0 ?
+
+set project="%~p0\..\projects\VS2010\zstd.sln"
+
+set output=%~p0%bin
+set output="%output%/%vs_solution_version%/%vs_platform%/"
+
+set msbuildparams=/verbosity:minimal /p:Platform="%vs_platform%" /p:Configuration="%vs_configuration%" /p:PlatformToolset="%vs_toolset%" /t:Clean,Build /nologo /p:OutDir=%output%
+
+echo ### Building %vs_solution_version% project for %vs_configuration% %vs_platform% (%vs_toolset%)...
+echo ### Build Params: %msbuildparams%
+
+%msbuild% %project% %msbuildparams%
+IF ERRORLEVEL 1 EXIT /B 1
+echo # Success
+echo # OutDir: %output%
+echo #
+