Build: Fix building releases on Windows

Single quotes don't work on the Windows command line. See
http://stackoverflow.com/a/24181667/2671 for details.

Fixes #89
Closes #90

Author: staabm

lib/cdn.js

@@ -61,7 +61,7 @@ module.exports = function( Release ) {
 			console.log( "Adding files..." );
 			Release.chdir( targetCdn );
 			Release.exec( "git add ." , "Error adding files." );
-			Release.exec( "git commit -m '" + commitMessage + "'" , "Error commiting files." );
+			Release.exec( "git commit -m \"" + commitMessage + "\"" , "Error commiting files." );
 		},
 
 		_pushToCdn: function() {

lib/git.js

@@ -3,7 +3,7 @@ module.exports = function( Release ) {
 Release.define({
 	gitLog: function( format ) {
 		var command = "git log " + Release.prevVersion + ".." + Release.newVersion + " " +
-				"--format='" + format + "'",
+				"--format=\"" + format + "\"",
 			result = Release.exec({
 				command: command,
 				silent: true

lib/repo.js

@@ -180,7 +180,7 @@ Release.define({
 			}
 		} else if ( patch === 0 ) {
 			Release.prevVersion = Release.exec(
-				"git for-each-ref --count=1 --sort=-authordate --format='%(refname:short)' " +
+				"git for-each-ref --count=1 --sort=-authordate --format=\"%(refname:short)\" " +
 				"refs/tags/" + [ major, minor - 1 ].join( "." ) + "*"
 			).trim();
 		} else {
@@ -237,14 +237,14 @@ Release.define({
 		Release.chdir( Release.dir.repo );
 		console.log( "Committing release artifacts..." );
 		Release.exec( "git add -f " + paths.join( " " ), "Error adding release artifacts to git." );
-		Release.exec( "git commit -m '" + Release.newVersion + "'",
+		Release.exec( "git commit -m \"" + Release.newVersion + "\"",
 			"Error committing release changes." );
 		console.log();
 
 		console.log( "Tagging release..." );
 		Release.exec( "git tag " + Release.newVersion,
 			"Error tagging " + Release.newVersion + "." );
-		Release.tagTime = Release.exec( "git log -1 --format='%ad'",
+		Release.tagTime = Release.exec( "git log -1 --format=\"%ad\"",
 			"Error getting tag timestamp." ).trim();
 	},
 
@@ -268,8 +268,8 @@ Release.define({
 		Release._versionJSON( "package.json", Release.nextVersion );
 
 		console.log( "Committing version update..." );
-		Release.exec( "git commit -am 'Build: Updating the " + Release.branch +
-			" version to " + Release.nextVersion + ".'",
+		Release.exec( "git commit -am \"Build: Updating the " + Release.branch +
+			" version to " + Release.nextVersion + ".\"",
 			"Error committing package.json." );
 	},