Add support to install on windows (#79)

* Added some paths that were missing on Windows

* Conditionalized 'make install'

* Set direction to execute install.sh with bash

Makefile

@@ -1,6 +1,7 @@
-export LD_LIBRARY_PATH=$(PWD)/libgit2/install/lib
-export DYLD_LIBRARY_PATH=$(PWD)/libgit2/install/lib
-export PKG_CONFIG_PATH=$(PWD)/libgit2/install/lib/pkgconfig
+export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$(PWD)/libgit2/install/lib
+export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$(PWD)/libgit2/install/lib
+export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$(PWD)/libgit2/install/lib/pkgconfig
+export C_INCLUDE_PATH=$C_INCLUDE_PATH:$(PWD)/libgit2/install/include
 URL_BASE_GIT2GO=https://github.com/libgit2/git2go/archive
 GIT2GO_VERSION=master
 GOPATH=$(shell go env GOPATH)
@@ -24,9 +25,4 @@ build:
 	@echo "Ready to go!"
 
 install:
-	@cp ./libgit2/install/lib/lib*  /usr/local/lib/
-	@ldconfig /usr/local/lib >/dev/null 2>&1 || echo "ldconfig not found">/dev/null
-	@cp ./gitql /usr/local/bin/gitql
-	@ln -s -f /usr/local/bin/gitql /usr/local/bin/git-ql
-	@echo "Git is in /usr/local/bin/gitql"
-	@echo "You can also use: git ql 'query here'"
+	@bash install.sh

install.sh

@@ -0,0 +1,32 @@
+#!/bin/bash 
+
+set -ex
+
+unameOut="$(uname -s)"
+case "${unameOut}" in
+    Linux*)     machine=Linux;;
+    Darwin*)    machine=Mac;;
+    CYGWIN*)    machine=Cygwin;;
+    MINGW*)     machine=MinGw;;
+    *)          machine="UNKNOWN:${unameOut}"
+esac
+
+if [[ $machine == MinGw ]]
+then
+ # Everything here is ugly. But MinGW seem to have no ldconfig, 
+ # no respect to /usr/local/bin, /usr/local/lib
+ cp ./libgit2/install/bin/libgit2.dll  /usr/bin/
+ cp ./gitql.exe /usr/bin/gitql.exe
+ ln -s -f /usr/bin/gitql.exe /usr/bin/git-ql
+ echo "Gitql.exe is in /usr/bin/gitql.exe"
+ echo "You can also use: git ql 'query here'"
+else
+ cp ./libgit2/install/lib/lib*  /usr/local/lib/
+ ldconfig /usr/local/lib >/dev/null 2>&1 || echo "ldconfig not found">/dev/null
+ cp ./gitql /usr/local/bin/gitql
+ ln -s -f /usr/local/bin/gitql /usr/local/bin/git-ql
+ echo "Git is in /usr/local/bin/gitql"
+ echo "You can also use: git ql 'query here'"
+fi
+
+